Attachment 9- 2023 Bridge Inspection Report .pdf

Inspection Date: 07/12/2023

Route: 803 Milepost: 0.1000 Structure No:

OVER

County, (Signature)

BRIDGE INSPECTION AND MANAGEMENT PROGRAM

INSPECTION TEAM LEADER: BART ASHER

U.S. DEPARTMENT OF AGRICULTURE

DAVIDSON R. BRIDGE

NATIONAL FORESTS IN NORTH CAROLINA

USDA FOREST SERVICE, REGION 8

081107000003122

ROAD BRIDGE INSPECTION REPORT

INSPECTION TYPE: ROUTINE

Transylvania North Carolina

DAVIDSON R. BRIDGE DAVIDSON RIVER

Structure Name: Date: 1/0/1900

Route: / Milepost: Structure No.: 0

Compass

(direction approximate)

Bearing: 39 deg.

(Plan-view, No Scale)

ORIENTATION:

Components lateral to flow are counted from Left-to-Right; when viewed from Upstream, looking Downstream

… such as: Abutments, Piers, Floor-beams

Components in line with flow are counted from Upstream-to-Downstream; when following the flow direction

… such as: Girders, Abutment Posts, Pier Columns

See also Compass-rose for additional orientation; "N" positioned to approximate north orientation along Span in plan-view

… Compass-Bearing, if provided, shows approximate alignment sighting from CL-Abut1 to CL-Abut2

TERMS AND ABBREVIATIONS

A, or, ABUT: Abutment Suffix with ## numbering sequence per reference above

AL, or, ALUM: Aluminum

APPR: Approach roadway Suffix with ## numbering sequence per reference above

C, or, COL: Column Suffix with ## numbering sequence per reference above

CL: Centerline, centerline of roadway alignment or center axis along member-shape

D, or, DIA: Diaphragm Suffix with ## numbering sequence per reference above

DS: Downstream

EMB: Embankment

F, or FT: Footer

G, or, GR: Girder Suffix with ## numbering sequence per reference above

GL: Glued-laminated

P, or, AP: Abutment Post Suffix with ## numbering sequence per reference above

P, or, PI: Pile Suffix with ## numbering sequence per reference above

RP: Rail Post Suffix with ## numbering sequence per reference above

US: Upstream

R: Rock, substantial natural outcrop among otherwise small bedform material

RAP: Riprap, imported and shaped bank armoring

S: S-shape, steel member with applicable description

SB: Scupper Block Suffix with ## numbering sequence per reference above

TH: Thalweg, lowest point of streambed channel

TIE: Tie-rod, post tensioning rod joining members with prescribed stress-level

W: W-shape, steel member with applicable description

WW: Wing-Wall, angled section of abutment extending beyond shoulder for embankment retention

BRIDGE ORIENTATION AND REPORT ABBREVIATIONS

US A1 WW US A2 WW

DS A2 WWDS A1 WW

APPR 1 APPR 2

RP1 RP2

G 1

G 2 P2

P1 A

B U

T

1 A B

U T

P

IE

R

P

IE

R

N

Structure Name: (8)Structure No:

(5D)Route:

Forest:

100.0

22.0

(45)No. Main Spans: 3

(46)No. Appr Spans: 0

No. Substrs: 4

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 required at each end? X N

Correct Signage? N

Yes No Special Inspection Equipment Needed:

Type 3 X

Type 3S2 X

Type 3-3 X

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 NORTH CAROLINA

County TRANSYLVANIA

ADT 300

2-WAY TRAFFIC (28A) Lanes on the Structure 2

Column Pier

Open, No Restriction

At Or Above Legal Loads

SPECIALIZED INSPECTIONS:

(43B)Superstr Type:

BRIDGE RATING SUMMARY:

Concrete Cast-In-Place (108A) Wearing

Surface:

(107)Deck StructureType:

(43A)Superstr Material:

(44A)Appr. Superstr Mat'l: Other

Steel

Concrete, Reinforced

HOT AND SUNNY

Months Inspection Cost

(49)Overall Br Length:

Other

98.30

Other

NBIS Bridge Opening:

99.99 00

Channel Beam

(53)Vertical(47)Horizontal

USDA FOREST SERVICE, REGION 8

(11)Milepost: 0.1000

BRIDGE IDENTIFICATION AND LOCATION

081107000003122

NATIONAL FORESTS IN NORTH CAROLINA

(32)Approach Roadway Width:

(48)Max Span:

(52)Deck Width out-out: 24.00(51)Roadway Width (Curb to Curb):

Security ID 0811PISGAH

30.00

BRIDGE DESCRIPTION and MEASUREMENTS

National Forests in North Carolina District:

64.00

(27)Year Built:

(6)Feature Crossed:

DAVIDSON R. BRIDGE

DAVIDSON RIVER

Infra data used for this report was pulled on: 05/15/2023

(92A) Fracture Critical (92B) Underwater

(92C) Special

UNKNOWN

LRFR REPORTED AS TONS

Time Completed:07/12/2023 Time Started:

INSPECTION INFORMATION

BART ASHER, GRANT ASHER

Longitude: -82.72165834

FS

Verified

2/19/2018

(102) Direction of Traffic

Substr Material:

200' S. JCT. US 276

Re-rating required ?

FS - Forest Service REGION 8

Inspection Template Revision Date: 06/15/2023

Recommended Inspection Frequency:

BART ASHER

35.28215000

(34)Skew:

Substr Type:

(44B)Superstr Type:

Specialized Inspections Required

(23 CFR 650.303)

Correct

Requirements?

Description:

Structure Name: (8)Structure No:

(5D)Route:

Forest:

Development Status: Date:

DATA Safe

Vehicle Type Date Oper. Load

HL-93 2/19/18 8 - LRFR REPORTED AS RATING FACTOR 0.88

HS20-44 10/30/10 1 - LOAD FACTOR REPORTED AS TONS 33.00 42.00

Type 3 2/19/18 3 - LRFR REPORTED AS TONS 41.00

Type 3S2 2/19/18 3 - LRFR REPORTED AS TONS 54.00

Type 3-3 2/19/18 3 - LRFR REPORTED AS TONS 61.00

NRL 2/19/18 3 - LRFR REPORTED AS TONS 41.00

SU4 2/19/18 3 - LRFR REPORTED AS TONS 40.00

SU5 2/19/18 3 - LRFR REPORTED AS TONS 41.00

SU6 2/19/18 3 - LRFR REPORTED AS TONS 41.00

SU7 2/19/18 3 - LRFR REPORTED AS TONS 41.00

EV2

EV3

Permit 1

Permit 2

Permit 3

Permit 4

User Defined 1

User Defined 2

User Defined 3

User Defined 4

Special

Alt. Interstate

H Loading

Railroad

Uniform

Gross Load Only

Gross Load

Security ID 0811

EXISTING - ACTIVE Jurisdiction: FS - FOREST SERVICE 7/12/2023

DAVIDSON RIVER(6)Feature Crossed:

LOAD RATING DATA

NATIONAL FORESTS IN NORTH CAROLINA

BRIDGE IDENTIFICATION AND LOCATION

(11)Milepost: 0.1000

Method

National Forests in North Carolina District: PISGAH

0.68

Inv.

Safe

Posting

19.00

DAVIDSON R. BRIDGE 081107000003122

Structure Name: DAVIDSON R. BRIDGE Date: 7/12/2023

Route: 803 / Milepost: 0.1 Structure No.: 081107000003122

CODE

Good

1. Good

2. Good

3. Good

4. Good

N/A

6 Minor hairline cracking is noted on the deck underside.

* 1. Good 1/4" deep scaling with 1/16" map cracking noted on deck topside.

C1. N/A

C2. Good

C3. N/A

C4. Good

C5. Good

C6. Good

C7. Fair Several of the joints have pulled apart in the downstream utilities.

C0 Deck OTHER Select

* 1. 4 Girder Good No section loss at present. See Item 59.C2 for paint.

a. Girder Diaphragms Good

b. Girder Bracing N/A

* 2. N/A

* 3. N/A

* 4. N/A

a. Trusses Bracing N/A

b. Trusses Chord N/A

c. Trusses Portal N/A

d. Trusses Vertical/Diagonal N/A

C1. Good

C2. Good Paint is aluminum over red lead. Minor paint flaking with surface rust.

C3. Good

C4. Good

C0 Superstructure OTHER N/A

*1. Good

*2. Good

*3. Good

*4. Good

*5. N/A

*6. Fair

*7. Good

*8. Good

*9. N/A

*10. Good

*11. Good

*12. Good

*13. Good

*14. Good

*15. Good

*16. Good Up to 3/8" scaling and abrasion at base of columns with spalling at random.

*17. Good

*18. N/A

C0 Substructure OTHER N/A

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

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

Wearing Surfaces

Deck Slab/Panels/Joists

(Overall Code for item, to be reported to

58. DECK:

APPROACH CONDITION:

Surfacing

Shoulder Embankment

Roadway Embankment

Approach Settlememt

REMARKS

CONDITION CODES and REMARKS

Floor Beam

60. SUBSTRUCTURE:

Piers Caps

Abutments Caps

Abutments Backwalls

59. SUPERSTRUCTURE:

Sidewalks

Drains and Drainage

Rideability

Cleanliness

Utilities

Deck Joints

Curbs

Stringer

Abutments Erosion or Scour

Abutments Piles/Bracing

Bearing Devices

Paint

Trusses

Deflection Under Load

Piers Bearing Seats

Piers Erosion or Scour

Piers Piles and Bracing

Piers Columns or Walls

Piers Footings

P

IE

R S

Piers Settlement

Piers Alignment (Tiping, Tilting)

* Only items with asterisk are used in the determination of the overall condition rating for that category, e.g. 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.

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

Structure Name: DAVIDSON R. BRIDGE Date: 7/12/2023

Route: 803 / Milepost: 0.1 Structure No.: 081107000003122

CODE(Overall Code for item, to be reported to REMARKS

CONDITION CODES and REMARKS

1. Good

2. Good

3. Good

4. Good

5. Good

6. Good

C0 Channel OTHER Good

N/A *1. Shape N/A

*2. N/A

*3. N/A

*4. N/A

5. N/A

C0 Culvert OTHER N/A

36. TRAFFIC SAFETY FEATURES:

36A. 0 36B. N

36C. N

36D. N

1.

Good

2. Good

72. APPROACH ROADWAY ALIGNMENT: 8

1. 8

2. 8

29. ROAD ADT 300

67. STRUCTURAL EVALUATION 6

68. DECK GEOMETRY: 4

69. UNDERCLEARANCE: N

71. WATERWAY ADEQUACY: 7

113. SCOUR CRITICAL BRIDGES: 5

Other potential Critical Findings? Describe on Critical Findings Tab

Abutment and Pier Types:

Load Rating Sketches

Vertical

Seams or Joints

Material Condition

Foundations

Headwall/Wingwall

Observed Lateral Movement

Clear Height

62. CULVERTS

Bridge Railing

Rail Transitions

Approach Guardrails

Approach Rail Ends

Signing

Object Markers

Horizontal

* Only items with asterisk are used in the determination of the overall condition rating for that category, e.g. 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.

A P

P R

A

IS

A L o f e le m e n ts

Channel Scour/Erosion

Channel Protection

Vegetation

Waterway Obstruction/Drift

61. CHANNEL and CHANNEL PROTECTION:

APPRAISAL CODES and REMARKS CONDITION of Elements

Yes Wall Type Abutment Spill Through

Abutment

Pier(s)

Timber Steel Concrete

Show SI&A Sheet

Milepost: 0.1000 Structure No.:

Work Item

Category Detailed Work Item Description C.F.

Related

Inspection Routine bridge inspection every

2 years

Approach

Condition rip rap eb 2

Embankment / Repair Approach Fill 1LS/B

LSRoutine Bridge Inspection / Routine

Work Item

Code

7003002

9001002

UnitWork Item Quantity

RECOMMENDED WORK ITEMS

Date:DAVIDSON R. BRIDGE

Route:

Structure Name:

081107000003122

07/12/2023

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Date:

Route: Milepost: Structure No:

Far Approach, looking back

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

803 0.1000 081107000003122

BRIDGE PHOTOS

Near Approach, looking ahead

Structure Topside View

Structure Underside View

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

803 0.1000 081107000003122

BRIDGE PHOTOS

BRIDGE PHOTOS

Upstream Elevation View

Downstream Elevation View

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

803 0.1000 081107000003122

BRIDGE PHOTOS

Near Abutment Elevation, stream flow from "left"

Far Abutment Elevation, stream flow from "right"

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

803 0.1000 081107000003122

BRIDGE PHOTOS

Stream View from Structure, looking downstream

Stream View from Structure, looking upstream

BRIDGE PHOTOS

utiities

Utilities separation

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

BRIDGE PHOTOS

Bent 1

Typical beam and bearing at pier

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

BRIDGE PHOTOS

Paint flaking

Bent 2 up to 5-6 feet scour at piles

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

BRIDGE PHOTOS

end bent 2 needs riprap typical connection

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

BRIDGE PHOTOS

downstream rail typ upstream rail typ

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

BRIDGE PHOTOS

Pavement distress app typ

Photo Caption

Structure Name: DAVIDSON R. BRIDGE 07/12/2023

Structure Name: Date:

Route: Milepost: 0.1000

15.0

2019 2021 2023 2025 2027 2029 2031

0.0 2.1 3.3

0.7 2.1 3.3

0.8 6.9 8.1

18.0 12 16.7

22.5 12.7 18.4

28.0 14.9 20.1

50.0 14.8 16.1

63.0 15.4 17.9

73.0 16.7 16.3

82.0 14.9 12.2

85.0 12.4 11.1

99.2 7.5 6.2

99.3 2.1 2.1

100.0 2.1 2.1

Water Surface 12.3

Channel Cross Section

Horizontal Dist

Measured from A-1

07/12/2023

Structure No: 081107000003122

DAVIDSON R. BRIDGE

Input Cross-Section Data:

Height (feet) from thalweg to bottom of lowest superstructure member

Horizontal Dist.

Location Notes

Top of RailDistance Measured from Upstream Side

0.0 20.0 40.0 60.0 80.0 100.0 120.0

Top of Rail

(Substructure elements can be inserted in the cross-section using Insert, Shapes )

Structural Inventory and Appraisal Sheet

USDA Forest Service: Name: DAVIDSON R. BRIDGE

(5D) Rte. No: 803 (11) MP: 0.1 (8) Str. No: 081107000003122

Route Name: DAVIDSON RIVER C.G. (112) NBIS Bridge Length

(1) State Name: NORTH CAROLINA (104) Highway System

(8) Structure Number: 081107000003122 (26) Functional Class

(5) Inventory Route: A:1 B:6 C:0 D:803.1 E:0 (100) Defense Highway

(2) Highway Agency District: 14 (101) Parallel Structure

(3) County: TRANSYLVANIA (4) Place Code: 00000 (102) Direction of Traffic

(6) Features Intersected: DAVIDSON RIVER Drawing Number 112

(7) Facility Carried: NFSR 803 (103) Temporary Structure

(9) Location: 200' S. JCT. US 276 (110) Designated National Network

(12) Base Highway Network: 0 (20) Toll

(13) LRS Inventory Route: 000000000000 (21) Maintain

(16) Lat / Long (37) Historical Significance

(98) Border Bridge St Code: 0 % Share: 0 Maint. Level:

(99) Border Bridge Structure No.: Insp. Resp.

(43) Structure Type Main: Mat'l: STEEL (58) Deck 6

Type: CHANNEL BEAM (59) Superstructure 7

(44) Structure Type Appr: Mat'l: OTHER (60) Substructure 7

Type: OTHER (61) Channel & Channel Protection 6

(45) Number of Spans in Main Unit: 3 (62) Culverts N

(46) Number of Approach Spans: 0

(107) Deck Structure Type: (67) Structural Evaluation 6

(108A) Type of Wearing Surface: OTHER (68) Deck Geometry 4

(108B) Type of Membrane: 0 (69) Underclearances, Vert. & Horiz. N

(108C) Type of Deck Protection: 0 (71) Waterway Adequacy 0

No.Substr Units: 4 Substr Type: COLUMN PIER (72) Approach Roadway Alignment 8

Substr Matr: CONCRETE, REINFORCED (36) Traffic Safety Features 0000

(113) Scour Critical Bridges 5

(27) Year Build: 1965

(106) Year Reconstructed: 1999 (38) Navigation Control: NO NAVIGATION CONTROL

(42) Type of Service On Highway: HIGHWAY (NO BRIDGE PERMIT)

Under Highway: WATERWAY (111) Pier Protection:

(28) Lanes On Structure: 2 Under Structure: 0 (39) Navigation Vertical Clearance: 0 ft.

(29) Average Daily Traffic (ADT): 300 (116) Vert-Lift Bridge Nav Min. Vert. Clr: 0 ft.

(30) Year of ADT: 1980(109) Truck ADT: 5 (40) Navigation Horizontal Clearance: 0 ft.

(19) Bypass, Detour Length: 2

(90) Routine Inspection Date

(48) Length of Maximum Span: 64 ft. (91) Frequency

(49) Structure Length: 100 ft. (92) Critical Feature Inspection (93) CFI Date

(50) Curb or Sidewalk: Left: 1 ft. Right: 1.0 ft. A) Fracture Critical Detail N A) 0

(51) Bridge Roadway Width Curb to Curb: 22.0 ft. B) Underwater Inspection N B) 0

(52) Deck Width Out to Out: 24.0 ft. C) Other Special Inspection N C) 0

(32) Approach Roadway Width (w/ Shoulders): 29.9 ft.

(33) Bridge Median: NO MEDIAN (31) Design Load

(34) Skew: 00(35) Structure Flared: NO FLARE (70) Bridge Posting

(10) Inventory Route Min. Vert. Clear: 99.99 ft. (41) Structure Open,

(47) Inventory Route Total Horiz. Clear: 2.1982 ft. Posted or Closed

(53) Min. Vert Clear over Bridge Rdwy: 99.99 ft.

(54) Min. Vert. Underclear: N0 ft.

(55) Min. Lat. Underclear Rt.: N0 ft.

(56) Min. Lat. Underclear Lt.: 0 ft.

National Forests in North Carolina R 8

IDENTIFICATION CLASSIFICATION

Y

NOT ON NAT'L HWY SYSTEM

NOT A DEFENSE HIGHWAY

NO PARALLEL STRUCTURE EXISTS

2-WAY TRAFFIC

L - LOCAL

OPEN, NO RESTRICTION

N

ON FREE ROAD

UNKNOWN

AT OR ABOVE LEGAL LOADS

CONDITION

FS - FOREST SERVICE

24 MONTHS

POSTING INFORMATION

APPRAISAL

35.28215 / -82.72165834

FS - FOREST SERVICE

NOT EVALUATED

8/20/2021

INSPECTIONS

NAVIGATION DATA

5 - HIGH DEGREE OF USER COMFORT

STRUCTURE TYPE AND MATERIAL

CONCRETE CAST-IN-PLACE

GEOMETRIC DATA

AGE AND SERVICE

Milepost:

ID

Description

Needed for Real Property Verification

N Re-rating required? (Enter Y/N)

N Specialized Equipment Required? (Enter Y/N)

Infra Summary Data

Structure Name: DAVIDSON R. BRIDGE 7/12/2023

Route: 803 0.1000 Structure No: 081107000003122

Main Data Appraisal Data

Insp Team Leader

Inspection_Type (System Generated) (System Generated)

Inspection Date 07/12/2023 ROUTINE

Inspection Freq 24

Wear Srfc Cond N/A

Deck Cond (58) 6

Inspection Cost $0.00

Aprch Cond Good

Culvert Cond (62) N/A

Channel Cond (61) 7

Supstr Cond (59) 7

Substr Cond (60) 6

Inspected By* BART ASHER

Done By (Org) FS - Forest Service

Scour Crit Br (113) 5

Insp Resp Name FS - FOREST SERVICE

Main Data Appraisal Data

Done By Name (Unit) REGION 8

Str Eval (67) 6

Deck Geom (68) 4

Approach Align (72) 8

Underclr (69) N

Waterway Adq (71) 7

Insp Remarks

Approach Rail Ends (36D) N

BART ASHER, GRANT ASHER

BART ASHER

Insp Team

Transition (36B) N

Approach Guardrail (36C) N

Traffic Rail Safety Features Appraisal

Bridge Rail (36A)

Structure Name: Date: 7/12/2023 Route: Milepost: 081107000003122

Vertical Wall Abutments Not on Piles or Bedrock Codings

Scour Scenarios Scour Critical Code Yes No Yes No Yes No Yes No Yes No Yes No

X X X X X X

Ideal field conditions. No active scour or stream stability issues 5

Footing Exposed Only 4

Footing Undermined (evaluate severity, substrate) 4 or 2

Footing Exposed Plus Constriction, Unstable or Attacking (evaluate severity, substrate) 4 or 2

Bridge Constricts Channel > 10% 4

Bridge Constricts Channel > 10% plus

Unstable or Attacking (evaluate severity, substrate) 4 or 2

Bridge on Unstable Channel with riprap in good condition, size and quantity. 5

Bridge on Unstable Channel with bank erosion and/or damaged riprap protection 4 or 2

Designed countermeasures installed, stable and performing well. 7

Severe scour, abutment failing 1 or 0

None of the above, Needs further review 6 yes (undermined) yes no no yes (undermined) no no no no no no yes no no no no

Fill in no yes

DAVIDSON R. BRIDGE

803 Structure No:

Scour Critical Coding, Item 113 Field Evaluation Guide

Is Footing

Exposed?

no yes

Parameters

Is Channel

Constriction greater than 10%?

no no

Is Flow Attacking?

no no no no no yes

Fill In

Is Stream Laterally or Vertically

Unstable?

no no no no

Fill In yes yes

Fill in

Fill in

Fill in

0.1000 no no

Fill in

Fill in no no

Bank Erosion no no

Other factors

Structure Name: Date: 7/12/2023 Route: Milepost: 081107000003122

Intermediate Piers Not on

Piles or Bedrock Codings

Scour Scenarios Scour Critical Code Yes No Yes No Yes No Yes No High Low Yes No

X X X X X X

Ideal field conditions. No active scour or stream stability issues 5

Footing Exposed Only 4

Footing Exposed Plus Constriction, Unstable, Attacking, debris potential 2

Bridge Constricts Channel > 10% 5

Bridge Constricts Channel > 10% plus

Unstable, Attacking alignment, debris potential (evaluate severity, substrate) 4 or 2

Bridge on Unstable Channel 5

Bridge on Unstable Channel with attacking alignment or debris potential

(evaluate severity) 4 or 2

Designed countermeasures installed, stable and performing well. 7

Severe scour, abutment failing 1 or 0

None of the above, Needs further review 6Fill In

Fill In no yes Fill in yes (undermined) Fill in no no no yes Fill in

Fill in no no yes no low no yes no yes no no low no yes no no no low no

DAVIDSON R. BRIDGE

803 Structure No:

Scour Critical Coding, Item 113 Field Evaluation Guide

Parameters no no no no low no

Is Footing

Exposed?

Is Channel

Constriction greater than 10%?

Is Stream Laterally or Vertically

Unstable?

Is Flow Alignment

Attacking? Debris Potential Other factors

0.1000