Bridge Inspection Rpt_STR 5460-032P.pdf

STRUCTURE SUMMARY STRUCTURE NO. 5460-032P

MILL CREEK BRIDGE INSPECTION DATE: 6/19/18

BRIDGE IDENTIFICATION AND DESCRIPTION

MAIN SPAN MATERIAL: ....... STEEL NO. OF MAIN SPANS:

MAIN SPAN TYPE: ............... STRINGER/MULTI-BEAM or GIRDER NO. OF APPR. SPANS:

# OF BEAMS, MAIN SPAN: .. 2 STRUCT. TOTAL LENGTH: .. 35.0 FT (10.7 M)

DECK TYPE: ......................... WOOD OR TIMBER MAX. SPAN LENGTH: .......... 35.0 FT (10.7 M)

WEARING SURFACE: .......... NONE DECK WIDTH: ...................... 12.1 FT (3.7 M)

ABUT. FOUNDATIONS: ........ SPREAD FTG ON BEARING MAT'L CURB TO CURB WIDTH: ..... 11.2 FT (3.4 M)

PIER FOUNDATION(S): ........ N/A YEAR BUILT:

ABUTMENT / PIER MAT'L: ... CONCRETE YEAR RECONSTRUCTED: .. 1980

PROJ./PLAN REF. NO: ......... 3B15 / NONE SKEW ANGLE: ..................... 0 °

NPS ROAD CLASS: .............. 2 - CONNECTOR ROAD FRACTURE CRITICAL: ........ YES

STRUCTURE HISTORY: ...... 1980-MAJOR RECONSTRUCTION/SUPERSTRUCTURE; 1993-DECK REPLACED;

1995-CONCRETE FOOTING APRONS PLACED, MORTAR JOINTS REPOINTED.

LOCATION

GREAT SMOKY MOUNTAINS NATIONAL PARK MILE POINT: ..................... 0.20 (KM PT 0.32)

STATE: ................................. TENNESSEE LOCATION: 0.2 MILE TO NPS ROUTE 500

FACILITY CARRIED: ............ FORGE CREEK ROAD

FEATURE INTERSECTED: .. MILL CREEK

STRUCTURE EVALUATION SUMMARY

This weathering steel beam bridge is in fair condition overall. The main problem with this bridge is scour and undermining with exposed footings at the abutments, northwest and southeast wingwalls; and undermining of the southeast retaining wall. Other problems include vegetation growth in the deteriorated mortar joints of the wingwalls;

damaged and missing reflective object markers; missing and split sections of curb; soil and debris accumulation on the bearing seats; and rutting of the deck and north approach.

This bridge is scheduled for replacement in the near future under Project GRSM 14(3), 112(1).

INSPECTION TEAM: M. BURNETT, C. BOSS (VOLKERT, INC.)

CONDITION ASSESSMENT:

MATT BURNETT, FIELD TEAM LEADER

REPORT REVIEW:

MARCUS MILLER, P.E., BRIDGE INSPECTION ENGINEER 703-404-6252

REPORT APPROVAL: DATE: 11/8/18

JORGOMAI CEESAY, PH.D., P.E., BIP SUPERVISORY ENGINEER 703-404-6244

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5460-032P

A (Critical) - Structure is closed, in imminent danger of collapse, or presents a critical safety hazard.

B (Major) - Structure exhibits severe deterioration, presents a safety hazard, or is designated a high priority due to age and/or condition.

C (Moderate) - Structure is deficient, functionally obsolete, or requires substantial repairs to prevent a serious deficiency or unsafe condition.

D (Minor) - Structure is generally in good condition. Preventative maintenance may be required.

E (Special) - Structure is under construction or reconstruction.

C226 PRIORITY OF IMPROVEMENT

ITEM

NO.

ROUTINE MAINTENANCE QTY. UNIT UNIT

COST

PRELIM.

COST

ESTIMATE

222.7 REPLACE/RESET DAMAGED/DISPLACED REFLECTIVE OBJECT MARKERS AT

BRIDGE CORNERS TO HELP IMPROVE MOTORIST SAFETY UNTIL BRIDGE CAN BE

REPLACED.

4 EA

PRELIM. MAINTENANCE TOTAL :

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS)

QTY. UNIT

UNIT

COST

PRELIM. COST

ESTIMATES

REHAB. RECONSTR.

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :

PRELIMINARY ESTIMATE TOTAL* :

(*Includes typical contract costs for mobilization, traffic control, and design/construction engineering; but does not include detour bridges, work beyond the bridge limits, or work not listed above. Estimates are approximate and are for preliminary planning purposes only; they should not be used as a complete or final engineers estimate.)

REMARKS: This bridge is scheduled for replacement in the near future under Project GRSM 14(3), 112(1).

FIELD INSPECTION REPORT STRUCTURE NO. 5460-032P

CONDITION RATING CODES FOR ITEMS 58 - 62, 222, 223

N NOT APPLICABLE 3 SERIOUS CONDITION - loss of section, deterioration, spalling, or scour have seriously affected primary structural components. Local failures are possible.

9 EXCELLENT CONDITION Fatigue cracks in steel or shear cracks in concrete may be present.

8 VERY GOOD CONDITION - no problems noted. 2 CRITICAL CONDITION - advanced deterioration of primary structural elements. Fatigue cracks in steel or shear cracks in concrete may be present

7 GOOD CONDITION - some minor problems. or scour may have removed substructure support. Unless closely monitored it may be necessary to close the structure until corrective action can be taken.

6 SATISFACTORY CONDITION - structural elements show some minor deterioration. 1 “IMMINENT” FAILURE CONDITION - major deterioration or sec ion loss present in critical structural components or obvious vertical or horizontal 5 FAIR CONDITION - all primary structural elements are sound but may have movement affecting structure stability. Structure is closed to traffic but minor section loss, cracking, spalling, or scour. corrective action may return structure to light service.

4 POOR CONDITION - advanced section loss, deterioration, spalling, or scour. 0 FAILED CONDITION - out of service; beyond corrective action.

CONDITION RATING CODE EQUIVALENTS FOR SUB-ELEMENTS

G = GOOD (CODES 7 - 9) F = FAIR (CODES 5 - 6) P = POOR (CODES 0 - 4)

58. DECK 5 ITEM REFERENCE AND REMARKS

F1. DECK SLAB

N2. EXPANSION JOINTS

N3. WEARING SURFACE

F4. RIDEABILITY

F5. CURBS, SIDEWALKS, AND MEDIAN

N6. PARAPETS AND/OR RAILINGS

F7. DRAINS AND DRAINAGE

N8. UTILITIES

G9. DEFLECTION AND/OR VIBRATION

G10. OTHER (VEGETATION)

59. SUPERSTRUCTURE 7

F1. BEARING DEVICES

G2. GIRDERS OR BEAMS

N3. ARCH(ES) OR SLAB(S)

N4. FLOOR BEAMS AND STRINGERS

N5. TRUSSES

G6. DIAPHRAGMS AND BRACING

N7. PAINT

N8. FASCIA(E)

G9. DEFLECTION AND/OR VIBRATION

G10. ALIGNMENT

N11. OTHER

60. SUBSTRUCTURE 6

58.1,7 2" X 8" (NOMINAL) SOUTHERN YELLOW PINE NAIL-LAMINATED

TIMBER DECK. MODERATE ABRASION IN WHEEL PATHS

THROUGHOUT WITH SEVERE RUTTING AT NORTH END, WITH

EXPOSED NAILS.

MODERATE DEBRIS ACCUMULATION ALONG CURBS.

58.5 MINOR TO MODERATE CHECKING OF TIMBER CURBS. CURBS

MISSING SECTIONS AT NORTHEAST AND SOUTHEAST CORNERS

DUE TO VEHICLE COLLISION. SEVERE SPLIT IN SOUTH END OF

EAST CURB WITH 2 BENT BOLTS.

58.10 MODERATE VEGETATION AND TREE GROWTH ENCROACHES WEST

SIDE OF STRUCTURE.

59.1,2,6 MINOR BULGING OF BEARING PADS AT SOUTH ABUTMENT. A588

WEATHERING STEEL. SEVERE RUSTING WITH SECTION LOSS

FROM BEARING CLIP ANGLES. MINOR FLAKING OF PATINA ON

BEAMS AND DIAPHRAGMS.

60.1 MINOR TO MODERATE HONEYCOMBING OF NORTH ABUTMENT

BREASTWALL.

60.3 MINOR TO MODERATE DEBRIS ACCUMULATION ON ABUTMENT

BEARING SEATS.

60.5 MINOR SCALING OF NORTH ABUTMENT FOOTING AT WATERLINE;

TIMBER FORM VISIBLE AT BOTTOM.

60.6 MODERATE CRACKING OF WINGWALL MASONRY MORTAR JOINTS

WITH MODERATE VEGETATION GROWTH.

ABUTMENTS

1. BREASTWALLS OR COLUMNS G

2. PILE BENTS N

3. CAPS AND/OR BEARING SEATS G

4. BACKWALLS AND/OR BULKHEADS G

5. FOUNDATIONS (CONCRETE FTG) G

6. WINGWALLS G

7. WEEP HOLES N

8. EXPANSION JOINTS N

9. EROSION AND/OR SCOUR F

10. SETTLEMENT OR DEFLECTION G

11. SLOPE PROTECTION N

12. OTHER N

PIER(S)

13. WALLS AND/OR COLUMNS N

14. PILE BENTS N

15. CAPS AND/OR BEARING SEATS N

16. FOUNDATIONS N

17. EROSION AND/OR SCOUR N

18. SETTLEMENT OR DEFLECTION N

19. OTHER N

FIELD INSPECTION REPORT STRUCTURE NO. 5460-032P

ITEM REFERENCE AND REMARKS

STREAM BED COMPOSITION : 9.

AVERAGE CLEAR OPENING 8.

NORMAL VELOCITY 7.

ADEQUACY OF OPENING 6.

OTHER 5.

WATERWAY OBSTRUCTIONS 4.

CHANNEL PROTECTION 3.

EROSION AND/OR SCOUR 2.

ALIGNMENT 1.

61. CHANNEL 5

P G N G N

MED

SUFF

3 FT.

ROCK, STONES

222. APPROACHES 6

1. APPROACH SLABS

2. RELIEF JOINTS

3. APPROACH GUARDRAIL

4. SURFACING

5. EROSION

6. SETTLEMENT

7. SIGNS

8. ALIGNMENT

9. OTHER

N N N F F F F G N

223. RETAINING WALL 6

1. WALL

2. WEEP HOLES

3. FOUNDATION

4. EROSION AND/OR SCOUR

5. SETTLEMENT OR DEFLECTION

6. OTHER

G N N F G N

36. TRAFFIC AND SAFETY FEATURES

A. BRIDGE RAILINGS

B. TRANSITIONS

C. APPROACH GUARDRAILS

D. APPROACH GUARDRAIL ENDS

N N N N

TRAFFIC SAFETY RATING CODES

0 - Does not meet standards or a safety feature is required and none is provided.

1 - Meets currently acceptable standards.

N - Not applicable or a safety feature is not required.

60.9 MODERATE SCOUR EXPOSING NORTH ABUTMENT FOOTING, UP TO

14' L X 3.6' H, WITH 3" OF UNDERMINING AT DOWNSTREAM END;

NORTHWEST WINGWALL FOOTING EXPOSED WITH UP TO 3" OF

UNDERMINING. EROSION ALONG NORTHEAST WINGWALL EXTENDS

BEHIND ABUTMENT BACKWALL APPROXIMATELY 0.8'.

SOUTH ABUTMENT FOOTING EXPOSED 1.8' H X 7' L ALONG NORTH

FACE WITH EXPOSED AREA 5' L ON UPSTREAM SIDE WITH UP TO

2.5' OF UNDERMINING. MODERATE SCOUR WITH UP TO 3.5' OF

UNDERMINING AT SOUTH END OF SOUTHEAST WINGWALL.

61.1 ALIGNMENT OF STREAM RESULTS IN FLOW DIRECTLY TOWARD

NORTH ABUTMENT AND ALONG WINGWALLS.

61.2 SEE BRIDGE FILE FOR SCOUR EVALUATION.

61.6 BRIDGE CONSTRICTS CHANNEL.

222.4,6 MODERATE RUTTING, UP TO 4" D, IN WHEEL PATHS AT NORTH

APPROACH; LARGE POTHOLE IN WEST WHEEL PATH NEAR BRIDGE

DECK.

222.7 MINOR DAMAGE TO NORTHWEST, NORTHEAST, AND SOUTHWEST

REFLECTIVE OBJECT MARKERS; MARKERS OUT OF POSITION WITH

BRIDGE. SOUTHEAST OBJECT MARKER NOT PROVIDED.

"ONE LANE BRIDGE" SIGN INSTALLED AT NORTH APPROACH; NOT

PROVIDED AT SOUTH APPROACH.

223.1 DRY STACKED STONE RETAINING WALL ALONG EAST SIDE OF

SOUTH APPROACH.

223.4 AREA OF EROSION 9' L X 3' W WITH UP TO 2.5' OF UNDERMINING OF

SOUTHEAST RETAINING WALL, APPROXIMATELY 40' SOUTH OF

SOUTH ABUTMENT; ADDITIONAL ADJACENT AREA ERODED 4' L X 2'

W WITH UP TO 6" OF UNDERMINING.

STRUCTURE LOAD RATING STRUCTURE NO. 5460-032P

TRUCK TYPE

INVENTORY RATING (NORMAL TRAFFIC) OPERATING RATING (MAXIMUM LOAD)

TONS METRIC TONS TONS METRIC TONS

H 15 14 25 23

HS 23 21 38 34

TYPE 3 20 18 33 30

TYPE 3S2 30 27 50 45

TYPE 3-3 39 35 66 60

DESIGN LOADING: UNKNOWN

CAPACITY MEETS OR EXCEEDS DESIGN LOAD

X CAPACITY IS LESS THAN DESIGN LOAD

ORIGINAL LOAD RATING CALCULATION APPLICABLE

X ORIGINAL LOAD RATING CALCULATION REVISED

DATE OF LOAD RATING CALCULATION: 1/16

LOAD RATING CONTROLLED BY: GIRDER MOMENT CAPACITY

REMARKS: SEE BRIDGE FILE FOR LOAD RATING CALCULATIONS.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5460-032P

STRUCTURE IDENTIFICATION

(201) PARK: GREAT SMOKY MOUNTAINS NATIONAL PARK (1) STATE: ....................................... 474 - TENNESSEE (TN)

(202) STRUCTURE NAME: .......... MILL CREEK BRIDGE (2) STATE HWY. AGENCY DIST:

(203) STRUCTURE KIND: ............1 - BRIDGE (3) COUNTY CODE: ........................ 009 - BLOUNT

(204) STRUCTURE NUMBER: ..... 5460-032P (4) CITY/PLACE CODE:

(205) NPS REGION: .................... 4 - SOUTHEAST (5) INVENTORY ROUTE:

(206) ROUTE CODE NUMBER: ... 126 (6) FEATURES INTERSECTED:....... MILL CREEK

(207) ROAD SECTION NO: ..........032P (7) FACILITY CARRIED: .................. FORGE CREEK ROAD

(208) NPS ROAD CLASS: ............ 2 - CONNECTOR ROAD (8) STATE STRUCTURE NO: .......... 5460032P0000000

(209) WITHIN NPS BNDRY?: .......YES (9) LOCATION: ................................ 0.2 MILE TO NPS ROUTE 500

(210) OPERATING UNIT: ............. N. DIST. (10) INV. RTE. - MIN. VERT. CLR: .. 99.99 FT (99.99 M)

(211) PROJECT NO(S): ................3B15 (11) MILE POINT: .............................0.20 (KM PT 0.32)

(212) DRAWING NUMBERS: ....... NONE (27) YEAR BUILT:

(21) MAINTAINED BY: ................. 66 - NATIONAL PARK SERVICE (106) YEAR RECONSTRUCTED:

(22) OWNER: ............................... 66 - NATIONAL PARK SERVICE (20) TOLL: ........................................3 - FREE ROAD

(37) HISTORICAL DESIGNATION: .. 5 - NOT ELIGIBLE

STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE

(43A) MAIN STR. MATERIAL: ..

(43B) MAIN STR. TYPE:

(45) NO. OF MAIN SPANS:

(48) MAX. SPAN LENGTH:

(49) STRUCTURE LENGTH:

(216A) ABUTMENT #1 FDN:

(216B) ABUTMENT #2 FDN:

(217A) PREDOM. PIER FDN.: ..

(217B) SECOND. PIER FDN: ...

(107) DECK TYPE:

3 - STEEL

02 - STRINGER/MULTI-BEAM or GIRDER

35.0 FT (10.7 M)

35.0 FT (10.7 M)

2 - SPREAD FTG ON BEARING MAT'L

2 - SPREAD FTG ON BEARING MAT'L

6 - N/A

6 - N/A

8 - WOOD OR TIMBER

(44A) APPR. STR. MATERIAL: ........ 0 - OTHER

(44B) APPR. STR. TYPE: ................ 00 - OTHER

(46) NO. OF APPROACH SPANS: .. 0

(108) WEAR SURFACE/PROTECT SYSTEM:

A) TYPE WEARING SURFACE: .. 0 - NONE

B) TYPE MEMBRANE: ................. 0 - NONE

C) TYPE PROTECTION: .............. 0 - NONE

(218) IS SALT USED?: ..................... NO

LOAD RATING AND POSTING

(31) DESIGN LOAD: ................. 0 - UNKNOWN (41) LOAD RESTRICTION: ......... A - OPEN, NO RESTRICTION

(66) INVENTORY RATING: ...... 23.0 TONS (21.0 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 38.0 TONS (34.5 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 6/18 (91) FREQ. OF INSP: 24 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):

(219) ADD. STUDIES NEEDED: N - 0 - NONE (A) FRACTURE CRITICAL: ... YES

INSP. EVERY: 24 MONTHS - LAST INSP. : 6/18 (220) SPECIAL STUDY TYPE: 0 - NONE

(B) UNDERWATER: .............. NO

(221) SPECIAL STUDY DATE: INSP. EVERY: MONTHS - LAST INSP. :

(C) SPECIAL INSPECTION: .. NO

INSP. EVERY: MONTHS - LAST INSP. :

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5460-032P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE: ............................. 35°35'03.40"

(17) LONGITUDE: ......................... 83°50'20.60"

(19) DETOUR LENGTH: ............... 50 MI (80 KM)

(28A) LANES ON STRUCT:

(28B) LANES UNDER STRUCT: ... 00

(42A) SERVICE ON: ..................... 1 - HIGHWAY

(42B) SERVICE UNDER: .............. 5 - WATERWAY

(29) AVG. DAILY TRAFFIC:

(30) YEAR OF ADT:

(114) FUTURE ADT:

(115) YEAR OF FUTURE ADT:

(101) PARALLEL STRUCTURE: ... N - NONE

(38) NAVIGATION CONTROL?: ... 0

(39) VERTICAL CLEARANCE: ...... 0.0 FT (0.0 M)

(40) HORIZ. CLEARANCE: ........... 0.0 FT (0.0 M)

(111) ABUT. OR PIER PROT:

LATERAL UNDERCLEARANCE:

(55) RIGHT: ....................... 0.0 FT (0.0 M)

(56) LEFT: ......................... 0.0 FT (0.0 M)

(51) CURB TO CURB WIDTH:

(52) DECK WIDTH:

(32) APPR. ROADWAY WIDTH:

(213) APPR. PAVEMENT WIDTH:

LEFT SHOULDER:

RIGHT SHOULDER:

(33) BRIDGE MEDIAN:

(34) SKEW ANGLE:

(35) DECK FLARE?:

(47) TOTAL HORIZ. CLEARANCE:

(50) SIDEWALKS:

LEFT :

RIGHT :

(214) BRIDGE RAIL TYPE:

RAIL CONFIGURATION:

MATERIAL:

DESIGN TYPE:

(215) BRIDGE RAIL HEIGHT:

(53) MIN. VRT. CLEAR. OVER DECK:

(54) MIN. VRT. UNDERCLEARANCE:

11.2 FT (3.4 M)

12.1 FT (3.7 M)

17.0 FT (5.2 M)

11.0 FT (3.4 M)

3.0 FT (0.9 M)

3.0 FT (0.9 M)

0 - NO MEDIAN

0 °

NO

11.2 FT (3.4 M)

0.0 FT (0.0 M)

0.0 FT (0.0 M)

4 - CURB-TYPE WHEEL GUAR

7 - TIMBER

1 - CONTINUOUS RAIL

0.75 FT (0.23 M)

99.99 FT (99.99 M)

0.00 FT (0.00 M)

CONDITION AND APPRAISAL DATA, PROPOSED IMPROVEMENTS, AND COST

(58) DECK:

(59) SUPERSTRUCTURE:

(60) SUBSTRUCTURE:

(61) CHANNEL:

(62) CULVERT: ...........................N

(222) APPROACHES:

(223) RETAINING WALL:

(36) TRAFFIC SAFETY FEAT: ... NNNN

(75A) TYPE OF WORK:

(75B) WORK DONE BY:

(76) IMPROVEMENT LENGTH: ..

(67) STRUCTURAL EVALUATION:

(68) DECK GEOMETRY:

(69) UNDERCLEARANCES:

(71) WATERWAY ADEQUACY:

(72) APPROACH ALIGNMENT:

(113) SCOUR CRITICAL:

(225) PURPOSE OF IMPROVEMENT:

(226) PRIORITY OF IMPROVEMENT:

(227) MAINTENANCE COST:

(228) REHAB./RECONSTR. COST: ...

(229) CONSTRUCTION COST:

N

4 - Stable; action required to pro

1 - MAINTENANCE

C - MODERATE

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1980-MAJOR RECONSTRUCTION/SUPERSTRUCTURE; 1993-DECK REPLACED; 1995-CONCRETE FOOTING APRONS PLACED, MORTAR

JOINTS REPOINTED.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

https://83�50'20.60 https://35�35'03.40

APPENDIX STRUCTURE NO. 5460-032P

PHOTOGRAPHS STRUCTURE NO. 5460-032P

PHOTO #1 - LOOKING NORTH TOWARD CADES COVE LOOP

FLOW

PHOTO #2 - EAST (UPSTREAM) SIDE

PHOTO #3 - GENERAL TOP SIDE VIEW LOOKING NORTH

PHOTO #4 - GENERAL UNDERSIDE VIEW LOOKING SOUTH

PHOTO #5 - NORTH APPROACH SIGNAGE

PHOTO #6 - POTHOLE IN NORTH APPROACH

PHOTO #7 - RUTTING OF WEST WHEEL PATH AT NORTH APPROACH;

NOTE POTHOLE

PHOTO #8 - TYPICAL RUTTING OF DECK IN WHEEL PATHS, WEST

WHEEL PATH AT NORTH END SHOWN

PHOTO #9 - MISSING SECTION FROM EAST CURB AT NORTH END

PHOTO #10 - TYPICAL ABRASION OF TIMBER DECK IN WHEEL PATHS

PHOTO #11 - TYPICAL DEBRIS ACCUMULATION ALONG CURBS, EAST

CURB SHOWN

PHOTO #12 - SPLITTING OF EAST CURB AT SOUTH END

PHOTO #13 - MISSING SECTION FROM WEST CURB AT SOUTH END

PHOTO #14 - LEANING NORTHWEST REFLECTIVE OBJECT MARKER

PHOTO #15 - GENERAL VIEW OF NORTH ABUTMENT

PHOTO #16 - HONEYCOMBING OF NORTH ABUTMENT BACKWALL

PHOTO #17 - TYPICAL SECTION LOSS FROM BEARING CLIP ANGLES,

NORTHEAST BEARING SHOWN; NOTE DEBRIS

PHOTO #18 - CHANNEL FLOW INTO EAST SIDE OF NORTH ABUTMENT;

NOTE EROSION OF CHANNEL BANK

PHOTO #19 - EROSION AT NORTHEAST BRIDGE CORNER EXTENDING

BEHIND NORTH ABUTMENT BACKWALL

PHOTO #20 - SCOUR ALONG DOWNSTREAM SIDE OF NORTH

ABUTMENT AND NORTHWEST WINGWALL; NOTE EXPOSED FOOTING

PHOTO #21 - TYPICAL PATINA DEVELOPED ON WEATHERING STEEL

BEAMS, WEST BEAM SHOWN

PHOTO #22 - EXPOSED SOUTH ABUTMENT FOOTING AT UPSTREAM

SIDE

PHOTO #23 - UNDERMINING OF SOUTHEAST RETAINING WALL; NOTE

VEGETATION GROWTH

PHOTO #24 - TYPICAL CRACKING OF WINGWALL MASONRY MORTAR

JOINTS, SOUTHEAST WINGWALL SHOWN; NOTE VEGETATION

GROWTH

PHOTO #25 - UPSTREAM CHANNEL; NOTE CHANNEL ALIGNMENT

PHOTO #26 - DOWNSTREAM CHANNEL