2023-HRWAT 2Inspection Report.pdf

Trail #-MP:

1 2

Material:

4 x 21.25'' x 8'' x

Material:

4 x 6'' x 8'' x

Material:

Material:

1.5'' x 5.5'' x x

Plan Number:

49' 144'' Service Under Bridge:

25.7' 144'' Vertical Under Bridge Opening (ft):

47' 76'' Top of Deck Height (ft):

0 N Vertical Clear Height (ft):

Rail Ht:

(in)

TIMBER, SAWN TREATED

TIMBER RUNNING PLANKS - UNTREATED

None

Wearing Surface:

DECK GIRDER

Overall Length (ft):

STEEL

TIMBER, SAWN TREATED

TIMBER, TREATED

INSPECTION

Forest/Special Use Unit:

Main Span Type:

CategoryBRIDGE IDENTIFICATION AND LOCATION

Trail Bridge Name: HRWAT #2 Trail Number-Bridge MP:

COMPLEX

31393-0.39

SNOW CAT

Androscoggin RD

STRUCTURE TYPE AND MATERIAL

Number of Main Spans:

SPREAD FOOTING

Location: 31393 Huntington Ravine Feature Crossed:

Quantity and Dimensions (Q x D” x W” x L'):

Deck Type: PLANK

Trail Class: 3 Designed Use:

White Mountain NF District:

Superstructure Number of Approach Spans:

Quantity and Dimensions (Q x D” x W” x L'):

Latitude: 44.267867 Longitude: -71.277913

TRACS

TRAIL BRIDGE

Curb Material:

Geometry / Design / Rating

Curb (Ht" x W"):

Rail Material:

Bridge Skew (°):

Dimensions (D”xW”xL”):

Approach Span Type: DECK GIRDER

Substructure Type:

User Barrier Rail Type:

Max Rail Opening:

(in)

WATERWAY

Maximum Span (ft):

Clear Span (ft):

Overall Deck Width (in):

Horizontal Clear Width (in):

Tread Width (in):

Structure Remarks

Superstructure: Beams 42.5” c-c, H=21.25", Wf =8”, Tf=0.68, Tw=0.6” (most likely W21x68). Steel stringers have almost full surface rust with only paint on the webs left. The bottom flange of the southern most stringer (S1) has several bends in it. The second and third stringers from the south (S2 & S3) have a significant bow in their webs at the eastern supports. S3 has a large bend in the top flange approximately 2' from the west end and also above the second diaphragm from the west. S2 is twisted at the east end and bears only on less than an inch of flange (north edge) with a 1/2"+ gap between the abutment and bottom of flange at the south edge. Diaphragms have nearly full surface rust, numerous bends and twists, flange deformations and cracked and questionable welds at the ends with only a few inches at the center where support for LTB is low.

Deck: 6.3’ c-c running plank spacing, with heavy weathering and signs of wear from years of use. Approach spans 10’ and 14’.

Foundation: The current foundation system comprises of 8x10 timbers resting on stacked stones. There is severe undermining of the substructure around the stacked stones, especially at the east abutment. There are significant gaps underneath both abutments but there is no apparent settlement and the bridge isn't showing signs of serious distress. This is a critical finding, due to the inherant instability.

Bridge Flare (Y/N):

Tr. Bridge Name: Feature Crossed: 0 31393-0.39HRWAT #2

TRACS

Tr. Bridge Name: Feature Crossed: 0 31393-0.39HRWAT #2

Inspection Date: 12

Inspected by:

N

Railing -

Beam S2 is twisted at east end and bears on the north flange edge.

Mostly gone, surface rust no section loss.

All

9/28/2023

Steve Wright, P.E.

Description:

36. User Barriers:

Post -

Curb -

NOB

Poor

Poor

Poor

Bad welds. Corroded. Deformed.

Deformations on top and bottom flanges. Girder S1 has multiple bottom flange bends. Girder S2 twisted at east end. S2 & S3 have a bow in the web at the east end. S3 has a large bend in the top flange ~2' from the west end and at the center web at the east end. S3 has a large bend in the top flange ~2' from the west end and at the center diaphragm.

Wood stringers in fair condition.

CONDITION CODES and REMARKS

Stringers/Girders

Diaphrams/Bracing

Stringers/Girders

REMARKS

Two track. Gouged with heavy wear and section loss.

Heavy weathering and lichen growth on most of the deck.

Soft boards near approach 1.

Fair

Fair

Fair

CODE

Bearings

Paint

Bracing

Floor Beams

Stringers/Girders

Inspection Frequency (Months):

ITEM

Wearing Surface:

58. DECK:

Cleanliness

Deck Slab/Panels

Drains and Drainage

Utilities

Deck Joints

Fair

Flooring

Girder

59. SUPERSTRUCTURE (Main Span):

NOB

NOB

Bearings

Paint

Bracing

Floor Beams

All

Flooring

Girder

Diaphrams/Bracing

Stringers/Girders

59. SUPERSTRUCT (Approach Span):

Tr. Bridge Name: Feature Crossed: 0 31393-0.39HRWAT #2

MEET

User Barrier

Bridge Grade

Trail Alignment

Trail Grade

Tread Width

Other

TRAIL APPROACHES:

Approach Settlement

Shoulder Embankment

Surfacing

71.WATERWAY ADEQUACY:

Sill/Grade Beam

P ie rs

61. Channel

Very little support at east abutment, sitting on a few rocks. Long term stability is questionable.

None present

Poor

NOB

Good

Good

Fair

Sill/Grade Beam

Good

Poor

NOB

Poor

All

60. SUBSTRUCTURE:

Alignment/Settlment/Skew

Scour/Erosion

Backing Plank/Backwall

Gabion/Reinforced Earth

Opening/Stream Constraint

Vertical Underbridge Opening

COMPONENT

Deck Width

VALUE

Fair

Fair

Good

Poor

Channel Protection

Channel Scour/Erosion

Vegetation

Waterway Obstruction/Drift

Bridge too low.

Appraisal – Bridge Elements Meet TMO? (Print TMO direct from INFRA Tr. Bridge Module)

Drop off at east end with rocks.

REMARKS

Very steep, rapids and waterfalls with full armoring

A2 sill split at DS end. Lower support piece crushing at west end.

Hiking trail/winter access road, rocky & rough

A bu tm en ts

Tr. Bridge Name: Feature Crossed: 0 31393-0.39HRWAT #2

TB-CPX-INS-LDR-02B

Any material $228.33 / EACH 4 Repair/replace/install safety signage

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Repair undermining/scour of sills/footings per abutment

User_Barrier Timber $59.34 / LN FT 98

Task ID

Comments

Repair/replace/install Curb

Superstructure Steel $8.26 / LB 1700

Task ID

Comments

Repair/replace superstructure members

Task ID

Comments

Whole_Bridge Any material $1.99 / SQ FT 1500

Task ID

Comments

Basic Maintenance

Comments

Inspection Task ID Steel $1725 / EACH - Difficult

TB-CPX-APR-SGN-02A

Install object markers

Replace in-kind

Item Category Task Material Cost/Unit Severity

Quantity

Whole_Bridge Any material $282.86 / SQ FT - Difficult 1200

Task ID

Comments

TB-CPX-WHL-03A

Tasks

Inspection-deck girder, side girder, single unit slab/beam 1

Approaches

Substructure Any material $1629.2 / EACH

TB-CPX-WHL-01A

Load rate the brige

TB-CPX-SUP-STL-02A

Replace girder 3

TB-CPX-SUB-GEN-02A

Repair substructure

TB-CPX-CRB-TBR-02A

Install timber curb, both sides

Tr. Bridge Name: Feature Crossed: 0 31393-0.39HRWAT #2

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

Task ID

Comments

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Comments

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Comments

Task ID

Comments

Tasks

Item Category Task

Task ID

Comments

Task ID

Comments

Material Cost/Unit Severity

Quantity

X

** As needed, insert additional pages for photos of structure and/or site.

47'

25.7'

0'' 0''

21.25'' 8''

76''

144''

HRWAT #2Structure Name: Feature Crossed: 0 Trail #-MP: 31393-0.39

0''

0''

49'

3.5417' 10.625'

9/28/2023

River Right Approach, A1

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River Left Approach, A2

Trail #-MP: 31393-0.39 Feature Crossed: 0.0000

BRIDGE PHOTOS

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Date:Structure Name: HRWAT #2

BRIDGE PHOTOS - cont.

Looking Upstream from the Bridge Deck. Bridge is cabled to rock upstream.

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Looking Downstream from the Bridge Deck

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

Trail #-MP: 31393-0.39

Looking Upstream - Elevation Profile

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Looking Downstream - Elevation Profile

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

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Approach span 1

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Approach span 2

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

West Abutment

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East Abutment, sill balanced on rocks

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

View of superstructure

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Scour under sill at A2

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

Approach span 2 superstructure

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A2. Split sill, rotated approach superstructure.

Structure Name: HRWAT #2 Date: 9/28/2023

Trail #-MP: 31393-0.39 Feature Crossed: 0.0000

Buckling in web. Could be from prior use. Girders appear to have been repurposed to this bridge.

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Hole in web at buckled location. Appears to be from diaphragm pressure against web. Diaphragm has since been removed.

Structure Name:

Feature Crossed: 0.0000

HRWAT #2 Date: 9/28/2023

Foundation plate balanced on rocks, stability is a concern

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Weld between girder and diaphragms

Structure Name: HRWAT #2 Date: 9/28/2023

Trail #-MP: 31393-0.39 Feature Crossed: 0.0000