addendum-2-rfb-dncr-2026-10.pdf

Monday February 9, 2026

Addendum #2 to answer questions

For

Bridge Approach Construction & Bridge Installation on Corridor 19 Snowmobile Trail in Chatham, NH

Department of Natural and Cultural Resources, Division of Parks and Recreation, Bureau of Trails

Request for Bid DNCR 2026-10 (Project Number TB-2601)

Key dates for bid timeline:

• Bid period opens on January 13, 2026

• End of Q&A period: Thursday February 19, 2026.

• State reply posting from Q&A period: Thursday February 26, 2026

• End of Bid period/Bid Opening: Thursday March 5, 2026.

Bridge Approach Construction & Bridge Installation on Corridor 19 Snowmobile Trail in Chatham, NH February 9, 2026

Addendum response to Q&A

RFB DNCR 2026-10 (Project No. TB-2601)

ADDENDUM #1a – supplemental information

TO: ALL CONTRACT BIDDERS

This addendum forms a part of the contract documents and modifies the bidding documents for Bridge Approach

Construction & Bridge Installation on Corridor 19 Snowmobile Trail in Chatham, (PROJECT No. TB-

2601), with amendments and deletions noted below.

Acknowledge receipt of this addendum in the space provided in the bid proposal form. Failure to do so may disqualify the Bidder.

This addendum consists of 91 pages.

CLARIFICATION TO BID QUESTIONS:

Attached load ratings for all bridges (3 attached documents) including the Langdon Brook bridge located off

Toad Hill Rd.

1) Attachment: Bridge name: Langdon Brook consists of 21 pages total.

2) Attachment: Bridge name: McDonough Brook 2 consists of 34 pages total.

3) Attachment: Bridge name: McDonough Brook 1 consists of 35 pages total.

END OF DOCUMENT

BRIDGE RATING FORMS

USFS REGION 9 LOAD RATING REPORT

STRUCTURE NUMBER: 092203000001038

Forest: WHITE MOUNTAIN Ranger District: SACO

Bridge Name: Langdon Brook No.: 39-0.6

Rated By: Jeff Dulka Date: 3/23/20 2:07 PM

SUMMARY OF RATING

RF Tons Controlling

Member Location Limit State

TYPE 3 RATING VEHICLE 1.47 36.71 (SLC) Deck Interior Shear

TYPE 3S2 RATING VEHICLE 1.54 55.36 (SLC) Deck Interior Shear

TYPE 3-3 RATING VEHICLE 1.51 60.54 (SLC) Deck Interior Shear

HL-93 LOADING - Inventory 0.71 - Stringer Interior Moment

HL-93 LOADING - Operating 0.92 - Stringer Interior Moment

SU4 1.41 38.18 (SLC) Stringer Interior Moment

SU5 1.30 40.44 (SLC) Stringer Interior Moment

SU6 1.21 42.04 (SLC) Stringer Interior Moment

SU7 1.19 46.06 (SLC) Stringer Interior Moment

*SLC = Safe Load Capacity **SPL = Safe Posting Load

Notes or Comments:

Notes on previous LR, AWC-NDS2018: Beams and Stringers DFL No.1 Fb=1600psi, FV=170psi, E=1600ksi;

Deck DFL, SS 2" and wider Fb=1350psi, FV=180psi

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 2:07 PM

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Load Rating Performed By: Jeff Dulka Signature/Date:

Load Rating Checked By: Willie Knaack Signature/Date:

Load Rating Approved By: Jeff Dulka Signature/Date:

Statement of Report Basis: Based on inspection dated 11/19/2018 Bridge Inspector: Jacob Ormes Organization: R09 TST

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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Inputs

Rating Method:

Load and Resistance Factor Rating U.S. Customary

Deck Type: Plank

Stringer Type: Solid Sawn

Number of Lanes: 1

Number of Stringers: 10

Stringer Span: 25.00 (ft)

Unbraced Length: 1.00 (ft)

E of Stringer: 1,600.000 (ksi)

Stringer Fb: 1.350 (ksi)

Stringer FV: 0.170 (ksi)

Deck Skew: 0.00 (deg)

Min. Plank Width: 11.25 (in)

Decking Fb: 1.350 (ksi)

Decking FV: 0.180 (ksi)

Component Dead Loads: 25.00 (plf)

Wearing Surface Dead Load: 8.00 (plf)

Wheel/Track Gage: 6.00 (ft)

Effective Length of Deck Resisting Wheel Load: 11.25 (in)

Exterior Stringer Live Load Distribution Factor: 0.04 (wheel loads)

Interior Stringer Live Load Distribution Factor: 0.22 (wheel loads)

Stringer Width: 7.75 (in)

Stringer Depth: 18.00 (in)

C-C Ext. Stringers: 13.50 (ft)

Deck Thickness: 2.50 (in)

Deck Travel Clear Width: 14.70 (ft)

Total Deck Width: 16.00 (ft)

Component Dead Load Factor, γDL: 1.25

Wearing Surface Dead Load Factor, γWS: 1.50

Design Inventory γLL 1.75 (for design loads)

Design Operating γLL 1.35 (for design loads)

Legal Live Load Factor, γL: 1.30 (for legal loads)

Permit Load Factor, γPL: 1.10 (for permit loads)

Stringer Moment Resistance Factor, Φ: 0.85

Stringer Shear Resistance Factor, Φ: 0.75

Stringer Condition Factor ΦC Good or Satisfactory (6 or Higher)

Timber Deck Moment Resistance Factor, Φ: 0.85

Timber Deck Shear Resistance Factor, Φ: 0.75

Deck Condition Factor ΦC Good or Satisfactory (6 or Higher)

System Factor 1.00

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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TYPE 3 RATING VEHICLE - Live Loading Results

Span Length: 25.00 (ft)

Maximum Moment: 179.86 (kip-ft)

Maximum Moment Location From Left End: 13.50 (ft)

Maximum Shear (at "3d" or "L/4"): 26.12 (kip)

Max. Bridge Live Load Deflection: 0.75 (in) L / 399

Maximum Reaction: 35.12 (kip)

Load Info

Load Axle No. 1: 16.00 (kip)

Load Axle No. 2: 17.00 (kip) Spacing: 15.00 (ft)

Load Axle No. 3: 17.00 (kip) Spacing: 4.00 (ft)

TYPE 3 RATING VEHICLE - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.40 (kip) 0.79 (kip-ft)

Stringer 6.84 (kip) 40.27 (kip-ft) 1.04 (kip) 7.19 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.47 1.53

Stringer 3.63 1.67 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 36.71 (tons)

Safe Posting Load N.A.

Rating Factor 1.47 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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TYPE 3S2 RATING VEHICLE - Live Loading Results

Maximum Moment: 170.81 (kip-ft)

Maximum Moment Location From Left End: 13.08 (ft)

Maximum Shear (at "3d" or "L/4"): 25.14 (kip)

Max. Bridge Live Load Deflection: 0.71 (in) L / 420

Maximum Reaction: 32.52 (kip)

Load Info

Load Axle No. 1: 10.00 (kip)

Load Axle No. 2: 15.50 (kip) Spacing: 11.00 (ft)

Load Axle No. 3: 15.50 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 15.50 (kip) Spacing: 22.00 (ft)

Load Axle No. 5: 15.50 (kip) Spacing: 4.00 (ft)

TYPE 3S2 RATING VEHICLE - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.29 (kip) 0.75 (kip-ft)

Stringer 6.59 (kip) 38.24 (kip-ft) 1.01 (kip) 6.83 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.54 1.60

Stringer 3.77 1.76 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 55.36 (tons)

Safe Posting Load N.A.

Rating Factor 1.54 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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TYPE 3-3 RATING VEHICLE - Live Loading Results

Maximum Moment: 148.12 (kip-ft)

Maximum Moment Location From Left End: 13.50 (ft)

Maximum Shear (at "3d" or "L/4"): 21.04 (kip)

Max. Bridge Live Load Deflection: 0.62 (in) L / 485

Maximum Reaction: 28.96 (kip)

Load Info

Load Axle No. 1: 12.00 (kip)

Load Axle No. 2: 12.00 (kip) Spacing: 15.00 (ft)

Load Axle No. 3: 12.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 16.00 (kip) Spacing: 15.00 (ft)

Load Axle No. 5: 14.00 (kip) Spacing: 16.00 (ft)

Load Axle No. 6: 14.00 (kip) Spacing: 4.00 (ft)

TYPE 3-3 RATING VEHICLE - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.33 (kip) 0.77 (kip-ft)

Stringer 5.51 (kip) 33.16 (kip-ft) 0.84 (kip) 5.92 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.51 1.58

Stringer 4.50 2.03 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 60.54 (tons)

Safe Posting Load N.A.

Rating Factor 1.51 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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HL-93 LOADING - Live Loading Results

Maximum Moment: 314.50 (kip-ft)

Maximum Moment Location From Left End: 13.00 (ft)

Maximum Shear (at "3d" or "L/4"): 44.04 (kip)

Max. Bridge Live Load Deflection: 1.31 (in) L / 228

Maximum Reaction: 54.08 (kip)

Load Info

Controlling Moment Load: Design Tandem and Lane

Controlling Shear Load: Design Tandem and Lane

Controlling Reaction Load: Design Truck and Lane

HL-93 LOADING - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 3.30 (kip) 1.08 (kip-ft)

Stringer 11.54 (kip) 70.41 (kip-ft) 1.76 (kip) 12.58 (kip-ft)

Inventory Rating Ratio

Interior Exterior

Shear Moment Shear Moment

Deck 0.80 0.83

Stringer 1.60 0.71 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Operating Rating Ratio

Interior Exterior

Shear Moment Shear Moment

Deck 1.03 1.07

Stringer 2.07 0.92 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Inventory GVW (Safe Load Capacity) N/A See Appendix C

Inventory Rating Factor 0.71

Operating GVW (Safe Load Capacity) N/A See Appendix C

Operating Rating Factor 0.92

Inventory γLL 1.75 (for design loads)

Operating γLL 1.35 (for design loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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SU4 - Live Loading Results

Maximum Moment: 212.81 (kip-ft)

Maximum Moment Location From Left End: 12.08 (ft)

Maximum Shear (at "3d" or "L/4"): 30.36 (kip)

Max. Bridge Live Load Deflection: 0.89 (in) L / 337

Maximum Reaction: 40.08 (kip)

Load Info

Load Axle No. 1: 12.00 (kip)

Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft)

Load Axle No. 3: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft)

SU4 - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.40 (kip) 0.79 (kip-ft)

Stringer 7.95 (kip) 47.64 (kip-ft) 1.21 (kip) 8.51 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.47 1.53

Stringer 3.12 1.41 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 38.18 (tons)

Safe Posting Load N.A.

Rating Factor 1.41 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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SU5 - Live Loading Results

Maximum Moment: 230.66 (kip-ft)

Maximum Moment Location From Left End: 12.78 (ft)

Maximum Shear (at "3d" or "L/4"): 31.88 (kip)

Max. Bridge Live Load Deflection: 0.96 (in) L / 311

Maximum Reaction: 42.32 (kip)

Load Info

Load Axle No. 1: 12.00 (kip)

Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft)

Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft)

SU5 - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.40 (kip) 0.79 (kip-ft)

Stringer 8.35 (kip) 51.64 (kip-ft) 1.28 (kip) 9.23 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.47 1.53

Stringer 2.97 1.30 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 40.44 (tons)

Safe Posting Load N.A.

Rating Factor 1.30 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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SU6 - Live Loading Results

Maximum Moment: 248.72 (kip-ft)

Maximum Moment Location From Left End: 12.20 (ft)

Maximum Shear (at "3d" or "L/4"): 31.88 (kip)

Max. Bridge Live Load Deflection: 1.04 (in) L / 289

Maximum Reaction: 42.26 (kip)

Load Info

Load Axle No. 1: 11.50 (kip)

Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft)

Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 6: 8.00 (kip) Spacing: 4.00 (ft)

SU6 - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.40 (kip) 0.79 (kip-ft)

Stringer 8.35 (kip) 55.68 (kip-ft) 1.28 (kip) 9.95 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.47 1.53

Stringer 2.97 1.21 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 42.04 (tons)

Safe Posting Load N.A.

Rating Factor 1.21 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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SU7 - Live Loading Results

Maximum Moment: 253.14 (kip-ft)

Maximum Moment Location From Left End: 13.50 (ft)

Maximum Shear (at "3d" or "L/4"): 31.88 (kip)

Max. Bridge Live Load Deflection: 1.06 (in) L / 284

Maximum Reaction: 42.26 (kip)

Load Info

Load Axle No. 1: 11.50 (kip)

Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft)

Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 6: 8.00 (kip) Spacing: 4.00 (ft)

Load Axle No. 7: 8.00 (kip) Spacing: 4.00 (ft)

SU7 - Stresses and Ratios

Dead Load Moment and Shear

Stringer Deck

Moment (DL + SDL) 5.28 (kip-ft) 0.00 (kip-ft)

Moment (WS) 0.06 (kip-ft) 0.00 (kip-ft)

Shear (DL + SDL) 0.74 (kip) 0.00 (kip)

Shear (WS) 0.01 (kip) 0.00 (kip)

Distributed Live Load Moment and Shear

Interior Exterior

Shear Bending Shear Bending

Deck 2.40 (kip) 0.79 (kip-ft)

Stringer 8.35 (kip) 56.67 (kip-ft) 1.28 (kip) 10.13 (kip-ft)

Rating Factor Ratios

Interior Exterior

Shear Bending Shear Bending

Deck 1.47 1.53

Stringer 2.97 1.19 N/A Wheel loads are inside first interior stringer

N/A Wheel loads are inside first interior stringer

Additional Information

Rating GVW (Safe Load Capacity) 46.06 (tons)

Safe Posting Load N.A.

Rating Factor 1.19 Bridge need not be posted for this load.

γLL 1.30 (for legal loads)

Multi-Presence Factor Reduction 0.95

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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Nominal Resistance

Stringer Deck

FV Tab. Stress 0.453 (ksi) 0.372 (ksi)

Fb Tab. Stress 3.032 (ksi) 2.159 (ksi)

Nominal Capacity Vn 42.12 (kip) 6.98 (kip)

Nominal Capacity Mn 105.76 (kip-ft) 2.11 (kip-ft)

Shear Capacity

Stringer Deck

Φ * Vn 31.59 (kip) 5.23 (kip)

Resistance Factor (Φ) 0.75 0.75

Moment Capacity

Stringer Deck

Φ * Mn 89.89 (kip-ft) 1.79 (kip-ft)

Resistance Factor (Φ) 0.85 0.85

Section Properties

Stringer Deck

Area 139.50 (in2) 28.13 (in2)

MOI X=3,766.50 (in4) Y=698.23 (in4) 14.65 (in4)

Section Modulus X=418.50 (in3) Y=180.19 (in3) 11.72 (in3)

Q 313.88 (in3) N/A

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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0.80

0.85

2.94

1.00

1.00

1.00

0.80

1.00

0.80

0.97

3.33

0.80

1.00

0.80

1.00

2.94

1.00

0.96

1.00

1.00

0.80

1.00

3.33

1.00

1.00

1.00

1.00

1.00

CFactors

Deck - Bending

Cλ:

CM:

CKF:

Cd:

Cfu:

CF:

Ci:

CX:

Deck - Shear

Cλ:

CM:

CKF:

Ci:

CX:

Stringer - Bending

Cλ:

CM:

CKF:

CL:

CF:

Ci:

CX:

Stringer - Shear

Cλ:

CM:

CKF:

Ci:

CX:

Stringer - E

CM:

Ci:

CX:

Bridge Name: Langdon Brook Bridge Number: 39-0.6 Last Save: 3/23/20 1:52 PM

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Structure Name: (8)Structure No:

(5D)Route:

Forest:

26.0

14.2

99.9

(45)No. Main Spans: 1

(46)No. Appr Spans: 0

No. Substrs: 2

Rating Date:

(41) Posting Status:

(70) Posting Capacity:

(31)Design Load: Yes/No Due

(63,65)Method of Load Rating: Freq. Date

Current Posting Signs Yes No N

Are weight limit signs posted at each end? N

Correct Signage? N

Yes No Special Inspection Equipment Needed:

Type 3 (No Rating)

Type 3S2 (No Rating)

Type 3-3 (No Rating)

X

Date:

Inspection Team: Leader: Jurisdiction:

Weather: Latitude:

(9)Location: Str. Life Remaining

Inspection Done By: Inspection Done By Name:

Critical Findings:

Narrative Report: (Add additional sheets if necessary)

Misc. INFRA Data

State NEW HAMPSHIRE

County CARROLL

ADT 0

1 LANE BRIDGE, 2-WAY TRAFFIC (28A) Lanes on the Structure 1

Wall Abutment

Open, No Restriction

At Or Above Legal Loads

SPECIALIZED INSPECTIONS:

(43B)Superstr Type:

BRIDGE RATING SUMMARY:

Timber - Treated (108A) Wearing

Surface:

(107)Deck StructureType:

(43A)Superstr Material:

(44A)Appr. Superstr Mat'l:

Timber, Sawn, Treated

Timber, Sawn, TreatedSubstr Material:

Specialized Inspections Required

(23 CFR 650.303)

Correct

Requirements?

LANGDON BROOK

Recommended Inspection Frequency:

Jacob Ormes

44.15986258

Months Inspection Cost

(49)Overall Br Length:

Description:

24.0

Timber Running Plank

NBIS Bridge Opening:

99.99 00

Stringer/Multi-Beam Or

Girder

(53)Vertical(47)Horizontal

3/1/1992

(102) Direction of Traffic

USDA FOREST SERVICE, REGION 9

(11)Milepost: 0.6000

BRIDGE IDENTIFICATION AND LOCATION

092203000001038

WHITE MOUNTAIN NATIONAL FOREST

(32)Approach Roadway Width:

(48)Max Span:

(52)Deck Width out-out: 16.0 sawn timber multi-girder, plank deck , post & wall abuts

(51)Roadway Width (Curb to Curb):

Security ID 0922SACO

14.0

BRIDGE DESCRIPTION and MEASUREMENTS

White Mountain National Forest District:

(44B)Superstr Type:

25.0

(27)Year Built:

(6)Feature Crossed: LANGDON BROOK

Infra data used for this report was pulled on: 04/24/2019

(92A) Fracture Critical (92B) Underwater

(92C) Special

HS20-44

UNKNOWN

Time Completed:11/19/2018 Time Started:

INSPECTION INFORMATION

Forest Service

Longitude: -71.01934261

FS

Verified

MAP 24

Re-rating required ?

FS - Forest Service REGION 9 - EASTERN REGION

Inspection Template Revision Date: 04/24/2019

(34)Skew:

Substr Type:

Milepost: 0.6000

CODE

Fair

1. Select

2. Select

3. Select

4. Select

* 1. Select

C1. Select

C2. Select

C3. Select

C4. Select

C5. Select

C6. Select

C7. Select

* 1. 10 Girder Good

a. Girder Diaphragms Select

b. Girder Bracing Select

* 2. Select

* 3. Select

* 4. Select

a. Trusses Bracing Select

b. Trusses Chord Select

c. Trusses Portal Select

d. Trusses Vertical/Diagonal Select

C1. Select

C2. Select

C3. Select

C4. Select

*1. Good *2. Fair *3. Good *4. Select *5. Select *6. Select *7. Select *8. Select *9. Select *10. Select *11. Select *12. Select *13. Select *14. Select *15. Select *16. Select *17. Select *18. Select

Some scour damage to footers

Piers Piles and Bracing

Piers Columns or Walls

Piers Footings

* Only these items are used in the determination of the overall condition rating for that category, i.e. Deck, Superstructure, Substructure.

Other items should be rated and remarked on but NOT included in determining the overall category rating. Items enumerated using a C

(ex. C1) should be commented on but not rated. See the FHWA Coding Guide for further information as to what is included in condition ratings.

P

IE

R S

Piers Settlement

Piers Alignment (Tiping, Tilting)

Structure No.:

Date:

Structure Name:

Route:

Wearing Surfaces

Deck Slab/Panels/Joists

(Overall Code for item, to be reported to

FHWA, in bold box)

58. DECK:

LANGDON BROOK

APPROACH CONDITION:

Surfacing

Shoulder Embankment

Roadway Embankment

Approach Settlememt

11/19/2018

092203000001038

CONDITION CODES and REMARKS

REMARKS

Poor, wide-spread abrasion and deterioration

Satisfactory

Floor Beam

60. SUBSTRUCTURE:

Piers Caps

Abutments Caps

Abutments Backwalls

Good

No noteworthy defects

59. SUPERSTRUCTURE:

Sidewalks

Drains and Drainage

Rideability

Cleanliness

Utilities

Deck Joints

Curbs

No notable settlement

Stringer

Abutments Erosion or Scour

Abutments Piles/Bracing

Bearing Devices

Paint

Deflection Under Load

Vibration Under Load

Abutments Weep Holes

A B

U T

M E

N T

S

Abutments Footings/Sills

Abutments Wing Walls

Abutments Alignments

Abutments Bearing Seats

Abutments Settlement

Trusses

Satisfactory

Proper alignment

Includes wingwalls integral with the abutment or the portion of the wingwall below the bearing seat.

Piers Bearing Seats

Piers Erosion or Scour

Also includes wingwalls connected to the superstructure above the beam seat.

Date:

Route: Milepost: Structure No:

Top Deck, looking back

11/19/2018

092203000001038

LANGDON BROOKStructure Name:

39 0.6000

Top Deck, looking ahead

BRIDGE PHOTOS

BRIDGE PHOTOS

Upstream Profile

Downstream Profile

Structure Name: LANGDON BROOK 11/19/2018

39 0.6000 092203000001038

BRIDGE PHOTOS

Abutment Elevation, stream-left

Abutment Elevation, stream right

Structure Name: LANGDON BROOK 11/19/2018

39 0.6000 092203000001038

Milepost: 0.6000

Structure Name: LANGDON BROOK 11/19/2018

Route: 39 Structure No: 092203000001038

13.5FT

X

X

18 inches

14.7 FT

16 FT

8x18 IN

3x10 IN wheel line

25 FT

26 FT

3x12 IN

9 IN

X

X

8 inches

10 in

24 FT

"Pick" and move them to the appropriate material or type, then add the dimension.text boxes

32 IN

STRUCTURE NUMBER: 092205000019095

Forest: WHITE MOUNTAIN Ranger District: SACO Bridge Name: McDonough Brook 2 No.: 244 - 0.1 Rated By: Justin Blake, P.E. Date: 7/22/20 1:47 PM

SUMMARY OF RATING

RF Tons Controlling Member Location Limit State

TYPE 3 RATING VEHICLE 0.38 2.88 (SPL) Stringer Exterior Moment TYPE 3S2 RATING VEHICLE 0.39 4.86 (SPL) Stringer Exterior Moment TYPE 3-3 RATING VEHICLE 0.46 9.26 (SPL) Stringer Exterior Moment HL-93 LOADING - Inventory 0.16 - Stringer Exterior Moment HL-93 LOADING - Operating 0.21 - Stringer Exterior Moment NRL 0.26 Close Stringer Exterior Moment SU4 0.32 0.80 (SPL) Stringer Exterior Moment SU5 0.29 Close Stringer Exterior Moment SU6 0.27 Close Stringer Exterior Moment SU7 0.26 Close Stringer Exterior Moment Tucker 1000 SNOMO GROOMER 1.52 8.03 (SLC) Stringer Exterior Moment H-10 Truck Loading LEGAL 0.57 3.79 (SPL) Deck Interior Moment

*SLC = Safe Load Capacity **SPL = Safe Posting Load

Notes or Comments:

No plans on file. Referenced 2019 inspection for dimensions. Built in 1990 (NRM). Inspection notes to close bridge to vehicular traffic and to load rate for use for snowmobile traffic. Rated for federally legal trucks and Tucker 1000 snowmobile groomer as a permit load. Referenced MNDOT Tbl 7.1.2.1-1 for stringer design stresses for bridges built from 1964-1990: Fb=1.600 ksi, FV=0.128 ksi, E=1600 ksi from NDS 2018 TBL 4D for select structural. Used 4"x6" nominal deck planks, proposed replacement. Deck planks SYP No.2: Fb=1.00 ksi, FV=0.175 ksi, E=1900 ksi per NDS TBL 4B for 6" wide. Cd=1.15 for plank deck. NDS 4B. Cm=1. NDS 4B Assume 25 plf railing deadload. Assume 50 pcf for timber density. Set unbraced length to 1' to force CL=1 since it is assumed the plank deck laterally supports the stringers.

Load Rating Performed By: Justin Blake, P.E.

Signature/Date:

Load Rating Checked By: Jeff Dulka, P.E.

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

7/22/2020

Load Rating Approved By: Jeff Dulka, P.E.

Statement of Report Basis: Based on inspection dated 9/11/2019 Bridge Inspector: Michael Bigelow, P.E.

Organization: FS - Forest Service R9 - Regional Office

Signature/Date: Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Rating Method: Load and Resistance Factor Rating U.S. Customary

Deck Type: Plank Stringer Type: Solid Sawn Number of Lanes: 1 Number of Stringers: 3 Stringer Span: 26.30 (ft) Unbraced Length: 1.00 (ft) E of Stringer: 1,600.000 (ksi) Stringer Fb: 1.600 (ksi) Stringer FV: 0.128 (ksi) Deck Skew: 0.00 (deg) Min. Plank Width: 5.50 (in) Decking Fb: 1.000 (ksi) Decking FV: 0.175 (ksi) Component Dead Loads: 25.00 (plf) Wearing Surface Dead Load: 0.00 (plf) Wheel/Track Gage: 5.00 (ft) Effective Length of Deck Resisting Wheel Load: 10.00 (in) Exterior Stringer Live Load Distribution Factor: 0.74 (wheel loads) Interior Stringer Live Load Distribution Factor: 0.28 (wheel loads) Stringer Width: 7.50 (in) Stringer Depth: 15.50 (in) C-C Ext. Stringers: 6.50 (ft) Deck Thickness: 3.50 (in) Deck Travel Clear Width: 12.00 (ft) Total Deck Width: 12.00 (ft) Component Dead Load Factor, γDL: 1.25 Wearing Surface Dead Load Factor, γWS: 1.50 Design Inventory γLL 1.75 (for design loads) Design Operating γLL 1.35 (for design loads) Legal Live Load Factor, γL: 1.30 (for legal loads) Permit Load Factor, γPL: 1.10 (for permit loads) Stringer Moment Resistance Factor, Φ: 0.85 Stringer Shear Resistance Factor, Φ: 0.75 Stringer Condition Factor ΦC Good or Satisfactory (6 or Higher) Timber Deck Moment Resistance Factor, Φ: 0.85 Timber Deck Shear Resistance Factor, Φ: 0.75 Deck Condition Factor ΦC Good or Satisfactory (6 or Higher) System Factor 1.00

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Span Length: 26.30 (ft) Maximum Moment: 190.84 (kip-ft) Maximum Moment Location From Left End: 14.15 (ft) Maximum Shear (at "3d" or "L/4"): 28.49 (kip) Max. Bridge Live Load Deflection: 4.71 (in) L / 67 Maximum Reaction: 35.86 (kip)

Load Info Load Axle No. 1: 16.00 (kip) Load Axle No. 2: 17.00 (kip) Spacing: 15.00 (ft) Load Axle No. 3: 17.00 (kip) Spacing: 4.00 (ft)

TYPE 3 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 8.22 (kip) 52.85 (kip-ft) 21.04 (kip) 140.93 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.80 1.01 0.70 0.38 Additional Information Rating GVW (Safe Load Capacity) 9.51 (tons) Safe Posting Load 2.88 (tons) Rating Factor 0.38 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 184.11 (kip-ft) Maximum Moment Location From Left End: 13.74 (ft) Maximum Shear (at "3d" or "L/4"): 26.90 (kip) Max. Bridge Live Load Deflection: 4.55 (in) L / 69 Maximum Reaction: 32.94 (kip)

Load Info Load Axle No. 1: 10.00 (kip) Load Axle No. 2: 15.50 (kip) Spacing: 11.00 (ft) Load Axle No. 3: 15.50 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 15.50 (kip) Spacing: 22.00 (ft) Load Axle No. 5: 15.50 (kip) Spacing: 4.00 (ft)

TYPE 3S2 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.43 (kip) 3.62 (kip-ft) Stringer 7.76 (kip) 50.98 (kip-ft) 19.86 (kip) 135.96 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.78 0.58 Stringer 1.90 1.05 0.74 0.39 Additional Information Rating GVW (Safe Load Capacity) 14.20 (tons) Safe Posting Load 4.86 (tons) Rating Factor 0.39 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 157.16 (kip-ft) Maximum Moment Location From Left End: 14.15 (ft) Maximum Shear (at "3d" or "L/4"): 23.22 (kip) Max. Bridge Live Load Deflection: 3.88 (in) L / 81 Maximum Reaction: 29.70 (kip)

Load Info Load Axle No. 1: 12.00 (kip) Load Axle No. 2: 12.00 (kip) Spacing: 15.00 (ft) Load Axle No. 3: 12.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 16.00 (kip) Spacing: 15.00 (ft) Load Axle No. 5: 14.00 (kip) Spacing: 16.00 (ft) Load Axle No. 6: 14.00 (kip) Spacing: 4.00 (ft)

TYPE 3-3 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.58 (kip) 3.72 (kip-ft) Stringer 6.70 (kip) 43.52 (kip-ft) 17.15 (kip) 116.06 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.76 0.57 Stringer 2.20 1.23 0.86 0.46 Additional Information Rating GVW (Safe Load Capacity) 18.49 (tons) Safe Posting Load 9.26 (tons) Rating Factor 0.46 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 335.99 (kip-ft) Maximum Moment Location From Left End: 13.65 (ft) Maximum Shear (at "3d" or "L/4"): 46.42 (kip) Max. Bridge Live Load Deflection: 8.30 (in) L / 38 Maximum Reaction: 55.38 (kip)

Load Info Controlling Moment Load: Design Tandem and Lane Controlling Shear Load: Design Tandem and Lane Controlling Reaction Load: Design Truck and Lane

HL-93 LOADING - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 9.83 (kip) 6.67 (kip-ft) Stringer 13.39 (kip) 93.04 (kip-ft) 34.28 (kip) 248.11 (kip-ft) Inventory Rating Ratio

Interior Exterior Shear Moment Shear Moment

Deck 0.32 0.23 Stringer 0.82 0.43 0.32 0.16 Operating Rating Ratio

Interior Exterior Shear Moment Shear Moment

Deck 0.42 0.30 Stringer 1.06 0.56 0.41 0.21 Additional Information Inventory GVW (Safe Load Capacity) N/A See Appendix C Inventory Rating Factor 0.16 Operating GVW (Safe Load Capacity) N/A See Appendix C Operating Rating Factor 0.21 Inventory γLL 1.75 (for design loads) Operating γLL 1.35 (for design loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

NRL - Live Loading Results

Maximum Moment: 276.72 (kip-ft) Maximum Moment Location From Left End: 13.41 (ft) Maximum Shear (at "3d" or "L/4"): 35.92 (kip) Max. Bridge Live Load Deflection: 6.83 (in) L / 46 Maximum Reaction: 44.46 (kip)

Load Info Load Axle No. 1: 6.00 (kip) Load Axle No. 2: 8.00 (kip) Spacing: 6.00 (ft) Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 6: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 7: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 8: 8.00 (kip) Spacing: 4.00 (ft)

NRL - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 10.36 (kip) 76.63 (kip-ft) 26.52 (kip) 204.34 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.42 0.70 0.56 0.26 Additional Information Rating GVW (Safe Load Capacity) 10.50 (tons)

Safe Posting Load N.A.

Rating Factor 0.26 Check all 3 legal loads for R.F. < 0.3 and consider closure.

γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 226.44 (kip-ft) Maximum Moment Location From Left End: 12.73 (ft) Maximum Shear (at "3d" or "L/4"): 32.81 (kip) Max. Bridge Live Load Deflection: 5.59 (in) L / 56 Maximum Reaction: 40.77 (kip)

Load Info Load Axle No. 1: 12.00 (kip) Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft) Load Axle No. 3: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft)

SU4 - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 9.46 (kip) 62.71 (kip-ft) 24.23 (kip) 167.22 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.56 0.86 0.61 0.32 Additional Information Rating GVW (Safe Load Capacity) 8.66 (tons) Safe Posting Load 0.80 (tons) Rating Factor 0.32 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 246.90 (kip-ft) Maximum Moment Location From Left End: 13.44 (ft) Maximum Shear (at "3d" or "L/4"): 34.16 (kip) Max. Bridge Live Load Deflection: 6.10 (in) L / 52 Maximum Reaction: 43.29 (kip)

Load Info Load Axle No. 1: 12.00 (kip) Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft) Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft)

SU5 - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 9.85 (kip) 68.37 (kip-ft) 25.22 (kip) 182.33 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.50 0.78 0.59 0.29 Additional Information Rating GVW (Safe Load Capacity) 9.12 (tons)

Safe Posting Load N.A.

Rating Factor 0.29 Check all 3 legal loads for R.F. < 0.3 and consider closure.

γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 267.56 (kip-ft) Maximum Moment Location From Left End: 12.83 (ft) Maximum Shear (at "3d" or "L/4"): 34.15 (kip) Max. Bridge Live Load Deflection: 6.61 (in) L / 48 Maximum Reaction: 43.21 (kip)

Load Info Load Axle No. 1: 11.50 (kip) Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft) Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 6: 8.00 (kip) Spacing: 4.00 (ft)

SU6 - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 9.85 (kip) 74.09 (kip-ft) 25.22 (kip) 197.58 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.50 0.72 0.59 0.27 Additional Information Rating GVW (Safe Load Capacity) 9.43 (tons)

Safe Posting Load N.A.

Rating Factor 0.27 Check all 3 legal loads for R.F. < 0.3 and consider closure.

γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Maximum Moment: 274.46 (kip-ft) Maximum Moment Location From Left End: 14.14 (ft) Maximum Shear (at "3d" or "L/4"): 34.15 (kip) Max. Bridge Live Load Deflection: 6.78 (in) L / 47 Maximum Reaction: 43.21 (kip)

Load Info Load Axle No. 1: 11.50 (kip) Load Axle No. 2: 8.00 (kip) Spacing: 10.00 (ft) Load Axle No. 3: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 5: 17.00 (kip) Spacing: 4.00 (ft) Load Axle No. 6: 8.00 (kip) Spacing: 4.00 (ft) Load Axle No. 7: 8.00 (kip) Spacing: 4.00 (ft)

SU7 - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.88 (kip) 3.93 (kip-ft) Stringer 9.85 (kip) 76.00 (kip-ft) 25.22 (kip) 202.68 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.54 Stringer 1.50 0.71 0.59 0.26 Additional Information Rating GVW (Safe Load Capacity) 10.25 (tons)

Safe Posting Load N.A.

Rating Factor 0.26 Check all 3 legal loads for R.F. < 0.3 and consider closure.

γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

Tucker 1000 SNOMO GROOMER - Live Loading Results

Maximum Moment: 53.69 (kip-ft) Maximum Moment Location From Left End: 13.15 (ft) Maximum Shear (at "3d" or "L/4"): 7.03 (kip) Max. Bridge Live Load Deflection: 1.33 (in) L / 238 Maximum Reaction: 8.17 (kip)

Load Info Vehicle Weight 10.58 (kip) Length of Track 12.00 (ft) Each Track Width 2.17 (ft)

Tucker 1000 SNOMO GROOMER - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 2.79 (kip) 1.94 (kip-ft) Stringer 2.03 (kip) 14.87 (kip-ft) 5.19 (kip) 39.65 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 49.45 35.23 Stringer 8.18 4.05 3.19 1.52 Additional Information Rating GVW (Safe Load Capacity) 8.03 (tons) Safe Posting Load N.A.

Rating Factor 1.52 Bridge need not be posted for this load.

γPL 1.10 (for permit loads) Multi-Presence Factor Reduction 1.00

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

H-10 Truck Loading LEGAL - Live Loading Results

Maximum Moment: 105.20 (kip-ft) Maximum Moment Location From Left End: 13.15 (ft) Maximum Shear (at "3d" or "L/4"): 14.92 (kip) Max. Bridge Live Load Deflection: 2.60 (in) L / 122 Maximum Reaction: 17.87 (kip)

Load Info Load Axle No. 1: 4.00 (kip) Load Axle No. 2: 16.00 (kip) Spacing: 14.00 (ft)

H-10 Truck Loading LEGAL - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 9.25 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.27 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.58 (kip) 3.72 (kip-ft) Stringer 4.30 (kip) 29.13 (kip-ft) 11.02 (kip) 77.69 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.76 0.57 Stringer 3.43 1.84 1.34 0.69 Additional Information Rating GVW (Safe Load Capacity) 5.66 (tons) Safe Posting Load 3.79 (tons) Rating Factor 0.57 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

FV Tab. Stress 0.341 (ksi) 0.362 (ksi) Fb Tab. Stress 3.658 (ksi) 2.164 (ksi) Nominal Capacity Vn 26.43 (kip) 8.44 (kip) Nominal Capacity Mn 91.54 (kip-ft) 3.68 (kip-ft) Shear Capacity

Stringer Deck Φ * Vn 19.82 (kip) 6.33 (kip) Resistance Factor (Φ) 0.75 0.75 Moment Capacity

Stringer Deck Φ * Mn 77.81 (kip-ft) 3.13 (kip-ft) Resistance Factor (Φ) 0.85 0.85 Section Properties

Stringer Deck Area 116.25 (in2) 35.00 (in2) MOI X=2,327.42 (in4) Y=544.92 (in4) 35.73 (in4) Section Modulus X=300.31 (in3) Y=145.31 (in3) 20.42 (in3) Q 225.23 (in3) N/A

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

1.00 2.94 1.15 1.00 1.00 0.80 1.00

0.80 0.97 3.33 0.80 1.00

0.80 1.00 2.94 1.00 0.97 1.00 1.00

0.80 1.00 3.33 1.00 1.00

1.00 1.00 1.00

CFactors Deck - Bending Cλ:

CM:

CKF:

Cd:

Cfu:

CF:

Ci:

CX:

Deck - Shear Cλ:

CM:

CKF:

Ci:

CX:

Stringer - Bending Cλ:

CM:

CKF:

CL:

CF:

Ci:

CX:

Stringer - Shear Cλ:

CM:

CKF:

Ci:

CX:

Stringer - E

CM:

Ci:

CX:

Bridge Name: McDonough Brook 2 Bridge Number: 244 - 0.1 Last Save: 7/22/20 1:47 PM

STRUCTURE NUMBER: 092205000019094

Forest: WHITE MOUNTAIN Ranger District: SACO Bridge Name: McDonough Brook 1 No.: 244 - 0.06 Rated By: Justin Blake, P.E. Date: 7/22/20 1:47 PM

SUMMARY OF RATING

RF Tons Controlling Member Location Limit State

TYPE 3 RATING VEHICLE 0.41 3.82 (SPL) Stringer Exterior Moment TYPE 3S2 RATING VEHICLE 0.43 6.91 (SPL) Stringer Exterior Moment TYPE 3-3 RATING VEHICLE 0.49 11.09 (SPL) Stringer Exterior Moment HL-93 LOADING - Inventory 0.17 - Stringer Exterior Moment HL-93 LOADING - Operating 0.23 - Stringer Exterior Moment NRL 0.29 Close Stringer Exterior Moment SU4 0.34 1.72 (SPL) Stringer Exterior Moment SU5 0.32 0.87 (SPL) Stringer Exterior Moment SU6 0.30 Close Stringer Exterior Moment SU7 0.29 Close Stringer Exterior Moment Tucker 1000 SNOMO GROOMER 1.64 8.70 (SLC) Stringer Exterior Moment H-10 Truck Loading LEGAL 0.58 3.95 (SPL) Deck Interior Moment

*SLC = Safe Load Capacity **SPL = Safe Posting Load

Notes or Comments:

No plans on file. Referenced 2019 inspection for dimensions. Built in 1990 (NRM). Inspection notes to close bridge to vehicular traffic and to load rate for use for snowmobile traffic. Rated for federally legal trucks and Tucker 1000 snowmobile groomer as a permit load. Referenced MNDOT Tbl 7.1.2.1-1 for stringer design stresses for bridges built from 1964-1990: Fb=1.600 ksi, FV=0.128 ksi, E=1600 ksi from NDS 2018 TBL 4D for select structural. Used 4"x6" nominal deck planks, proposed replacement. Deck planks SYP No.2: Fb=1.00 ksi, FV=0.175 ksi, per NDS TBL 4B for 6" wide. Cd=1.15 for plank deck. NDS 4B. Cm=1. NDS 4B Assume 25 plf railing deadload. Assume 50 pcf for timber density. Set unbraced length to 1' to force CL=1 since it is assumed the plank deck laterally supports the stringers.

Load Rating Performed By: Justin Blake, P.E.

Signature/Date:

Load Rating Checked By: Jeff Dulka, P.E.

Bridge Name: McDonough Brook 1 Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Load Rating Approved By: Jeff Dulka, P.E.

Statement of Report Basis: Based on inspection dated 09/11/2019 Bridge Inspector: Michael Bigelow, P.E.

Organization: FS - Forest Service R9 - Regional Office

Signature/Date: Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Rating Method: Load and Resistance Factor Rating U.S. Customary

Deck Type: Plank Stringer Type: Solid Sawn Number of Lanes: 1 Number of Stringers: 3 Stringer Span: 24.00 (ft) Unbraced Length: 1.00 (ft) E of Stringer: 1,600.000 (ksi) Stringer Fb: 1.600 (ksi) Stringer FV: 0.128 (ksi) Deck Skew: 0.00 (deg) Min. Plank Width: 5.50 (in) Decking Fb: 1.000 (ksi) Decking FV: 0.175 (ksi) Component Dead Loads: 25.00 (plf) Wearing Surface Dead Load: 0.00 (plf) Wheel/Track Gage: 6.00 (ft) Effective Length of Deck Resisting Wheel Load: 10.00 (in) Exterior Stringer Live Load Distribution Factor: 0.76 (wheel loads) Interior Stringer Live Load Distribution Factor: 0.06 (wheel loads) Stringer Width: 7.00 (in) Stringer Depth: 15.75 (in) C-C Ext. Stringers: 6.33 (ft) Deck Thickness: 3.50 (in) Deck Travel Clear Width: 12.00 (ft) Total Deck Width: 12.00 (ft) Component Dead Load Factor, γDL: 1.25 Wearing Surface Dead Load Factor, γWS: 1.50 Design Inventory γLL 1.75 (for design loads) Design Operating γLL 1.35 (for design loads) Legal Live Load Factor, γL: 1.30 (for legal loads) Permit Load Factor, γPL: 1.10 (for permit loads) Stringer Moment Resistance Factor, Φ: 0.85 Stringer Shear Resistance Factor, Φ: 0.75 Stringer Condition Factor ΦC Good or Satisfactory (6 or Higher) Timber Deck Moment Resistance Factor, Φ: 0.85 Timber Deck Shear Resistance Factor, Φ: 0.75 Deck Condition Factor ΦC Good or Satisfactory (6 or Higher) System Factor 1.00

Bridge Name: McDonough Brook 1 Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Span Length: 24.00 (ft) Maximum Moment: 171.42 (kip-ft) Maximum Moment Location From Left End: 13.01 (ft) Maximum Shear (at "3d" or "L/4"): 26.30 (kip) Max. Bridge Live Load Deflection: 3.70 (in) L / 78 Maximum Reaction: 34.50 (kip)

Load Info Load Axle No. 1: 16.00 (kip) Load Axle No. 2: 17.00 (kip) Spacing: 15.00 (ft) Load Axle No. 3: 17.00 (kip) Spacing: 4.00 (ft)

TYPE 3 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 7.56 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.12 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.84 (kip) 3.85 (kip-ft) Stringer 4.77 (kip) 10.72 (kip-ft) 19.94 (kip) 129.98 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.73 0.55 Stringer 2.95 4.93 0.71 0.41 Additional Information Rating GVW (Safe Load Capacity) 10.17 (tons) Safe Posting Load 3.82 (tons) Rating Factor 0.41 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 1 Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Maximum Moment: 160.59 (kip-ft) Maximum Moment Location From Left End: 12.58 (ft) Maximum Shear (at "3d" or "L/4"): 25.44 (kip) Max. Bridge Live Load Deflection: 3.46 (in) L / 83 Maximum Reaction: 32.17 (kip)

Load Info Load Axle No. 1: 10.00 (kip) Load Axle No. 2: 15.50 (kip) Spacing: 11.00 (ft) Load Axle No. 3: 15.50 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 15.50 (kip) Spacing: 22.00 (ft) Load Axle No. 5: 15.50 (kip) Spacing: 4.00 (ft)

TYPE 3S2 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 7.56 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.12 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.40 (kip) 3.55 (kip-ft) Stringer 4.61 (kip) 10.05 (kip-ft) 19.29 (kip) 121.77 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.79 0.59 Stringer 3.05 5.26 0.73 0.43 Additional Information Rating GVW (Safe Load Capacity) 15.63 (tons) Safe Posting Load 6.91 (tons) Rating Factor 0.43 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 1 Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Maximum Moment: 141.17 (kip-ft) Maximum Moment Location From Left End: 13.01 (ft) Maximum Shear (at "3d" or "L/4"): 21.11 (kip) Max. Bridge Live Load Deflection: 3.04 (in) L / 95 Maximum Reaction: 28.33 (kip)

Load Info Load Axle No. 1: 12.00 (kip) Load Axle No. 2: 12.00 (kip) Spacing: 15.00 (ft) Load Axle No. 3: 12.00 (kip) Spacing: 4.00 (ft) Load Axle No. 4: 16.00 (kip) Spacing: 15.00 (ft) Load Axle No. 5: 14.00 (kip) Spacing: 16.00 (ft) Load Axle No. 6: 14.00 (kip) Spacing: 4.00 (ft)

TYPE 3-3 RATING VEHICLE - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 7.56 (kip-ft) 0.01 (kip-ft) Moment (WS) 0.00 (kip-ft) 0.00 (kip-ft) Shear (DL + SDL) 1.12 (kip) 0.01 (kip) Shear (WS) 0.00 (kip) 0.00 (kip) Distributed Live Load Moment and Shear

Interior Exterior Shear Bending Shear Bending

Deck 5.55 (kip) 3.65 (kip-ft) Stringer 3.83 (kip) 8.83 (kip-ft) 16.01 (kip) 107.05 (kip-ft) Rating Factor Ratios

Interior Exterior Shear Bending Shear Bending

Deck 0.77 0.58 Stringer 3.68 5.99 0.88 0.49 Additional Information Rating GVW (Safe Load Capacity) 19.76 (tons) Safe Posting Load 11.09 (tons) Rating Factor 0.49 γLL 1.30 (for legal loads) Multi-Presence Factor Reduction 0.95

Bridge Name: McDonough Brook 1 Bridge Number: 244 - 0.06 Last Save: 7/22/20 1:47 PM

Maximum Moment: 298.16 (kip-ft) Maximum Moment Location From Left End: 12.50 (ft) Maximum Shear (at "3d" or "L/4"): 44.47 (kip) Max. Bridge Live Load Deflection: 6.43 (in) L / 45 Maximum Reaction: 53.51 (kip)

Load Info Controlling Moment Load: Design Tandem and Lane Controlling Shear Load: Design Tandem and Lane Controlling Reaction Load: Design Tandem and Lane

HL-93 LOADING - Stresses and Ratios Dead Load Moment and Shear

Stringer Deck Moment (DL + SDL) 7.56 (kip-ft) 0.01 (kip-ft)…