Bridge_Inspection_Report_5460-019P_Laurel_Creek_Bridge__2.pdf

BRIDGE INSPECTION REPORT

LAUREL CREEK BRIDGE #2

LAUREL CREEK ROAD OVER LAUREL CREEK

GREAT SMOKY MOUNTAINS NATIONAL PARK

LN

STRUCTURE NO. 5460-019P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 5/11/14

Report prepared by: ED

Federal Highway Administration Federal Lands Bridge Office Bridge Inspection and Management Program 21400 Ridgetop Circle Sterling, Virginia 20166 http://www.efl.fhwa.dot.gov/FLHBO/BIP http://www.efl.fhwa.dot.gov/FLHBO/BIP

STRUCTURE SUMMARY STRUCTURE NO. 5460-019P

LAUREL CREEK BRIDGE #2 INSPECTION DATE: 5/11/14

BRIDGE IDENTIFICATION AND DESCRIPTION

MAIN SPAN MATERIAL:

MAIN SPAN TYPE:

# OF BEAMS, MAIN SPAN: ..

DECK TYPE:

WEARING SURFACE:

ABUT. FOUNDATIONS:

PIER FOUNDATION(S):

ABUTMENT / PIER MAT'L: ...

PROJ./PLAN REF. NO:

NPS ROAD CLASS:

STRUCTURE HISTORY:

CONCRETE

ARCH - DECK

NOT APPLICABLE

NOT APPLICABLE

SPREAD FTG ON BEARING MAT'L

N/A

CONCRETE

3B2 / 2009B

1 - PRINCIPAL PARK ROAD

NO. OF MAIN SPANS:

NO. OF APPR. SPANS:

STRUCT. TOTAL LENGTH: ..

MAX. SPAN LENGTH:

DECK WIDTH:

CURB TO CURB WIDTH:

YEAR BUILT:

YEAR RECONSTRUCTED: ..

SKEW ANGLE:

FRACTURE CRITICAL:

51.0 FT (15.5 M)

51.0 FT (15.5 M)

39.0 FT (11.9 M)

34.0 FT (10.4 M)

N/A

43 °

NO

LOCATION

GREAT SMOKY MOUNTAINS NATIONAL PARK MILE POINT: ..................... 2.70 (KM PT 4.35)

STATE: ................................. TENNESSEE LOCATION: 2.7 MI TO NPS ROUTE 16

FACILITY CARRIED: ............ LAUREL CREEK ROAD

FEATURE INTERSECTED: .. LAUREL CREEK

STRUCTURE EVALUATION SUMMARY

This concrete arch bridge is in good condition overall, and has only minor problems at this time. These include channel bank sloughing due to the alignment of the stream, scour along the north abutment, deterioration of the parapet mortar joints, a drop-off from the pavement along the southern repaired portion of the west shoulder, and an area of erosion along the southwest wingwall.

Since the previous inspection, the northern portion of the west shoulder has been patched.

Corrective measures should be taken as outlined in this report to prevent the possible development of more serious or costly problems in the future.

INSPECTION TEAM: W. ROBIN, B. CARPER (GANNETT FLEMING).

CONDITION ASSESSMENT:

WIL ROBIN, P.E., FIELD TEAM LEADER

REPORT REVIEW :

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

REPORT APPROVAL: DATE: 9/30/14

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

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5460-019P

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

B (Major) - Structure is seriously deficient or presents a safety hazard, but can remain in service at reduced loads or with frequent inspections.

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.

D226 PRIORITY OF IMPROVEMENT

ITEM

NO.

MAINTENANCE RECOMMENDATIONS

(GENERALLY NOT FLHP ELIGIBLE)

QTY. UNIT COST

UNIT

ESTIMATE

COST

PRELIM.

61.1 PLACE ENGINEERED RIPRAP ALONG NORTH CHANNEL BANKS AND NORTH

ABUTMENT TO PREVENT ADDITIONAL EMBANKMENT LOSS.

10 CY

58.6 REPOINT PARAPET MORTAR JOINTS AS NECESSARY. 40 LF

58.3, 60.9 PLACE SUITABLE FILL ALONG WEST SHOULDER AT EDGE OF PAVEMENT AND IN

HOLE ALONG SOUTHWEST WINGWALL.

1 LS

PRELIM. MAINTENANCE TOTAL :

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS)

QTY. UNIT

UNIT

COST ESTIMATES

PRELIM. COST

REHAB. RECONSTR.

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :

COST ESTIMATE SUMMARY

PRELIM. MAINTENANCE TOTAL:

PRELIM. REHABILITATION TOTAL:

PRELIM. RECONSTRUCTION TOTAL: ..

TOTAL ITEMIZED COSTS:

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: Cost estimates assume that recommended actions will be combined with similar work being performed on other structures.

FIELD INSPECTION REPORT STRUCTURE NO. 5460-019P

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 section 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 N ITEM REFERENCE AND REMARKS

N1. DECK SLAB

N2. EXPANSION JOINTS

G3. WEARING SURFACE

G4. RIDEABILITY

N5. CURBS, SIDEWALKS, AND MEDIAN

G6. PARAPETS AND/OR RAILINGS

G7. DRAINS AND DRAINAGE

N8. UTILITIES

N9. DEFLECTION AND/OR VIBRATION

N10. OTHER

59. SUPERSTRUCTURE 7

N1. BEARING DEVICES

N2. GIRDERS OR BEAMS

G3. ARCH(ES) OR SLAB(S)

N4. FLOOR BEAMS AND STRINGERS

N5. TRUSSES

N6. DIAPHRAGMS AND BRACING

N7. PAINT

G8. FASCIA(E)

G9. DEFLECTION AND/OR VIBRATION

G10. ALIGNMENT

N11. OTHER

60. SUBSTRUCTURE 7

58.3, 222.4 PAVEMENT IN GOOD CONDITION. PREVIOUSLY NOTED 3"

DROP-OFF ALONG WEST SHOULDER NEAR NORTH BRIDGE END

REPAIRED SINCE PREVIOUS INSPECTION. 3" DROP-OFF

SOUTHWEST SIDE OF SOUTH APPROACH.

58.6 MINOR VEGETATION AND MOSS GROWTH ON PARAPETS. MINOR

TO MODERATE DETERIORATION OF MASONRY MORTAR JOINTS,

WITH SOME VEGETATION GROWTH.

59.3,8 MODERATE EFFLORESCENCE AND WATER LEAKAGE AT

CONSTRUCTION JOINT ON ARCH UNDERSIDE; MINOR CRACKING OF

UNDERSIDE ELSEWHERE WITH EFFLORESCENCE. MODERATE

EFFLORESCENCE ALONG FASCIA RING STONES. MODERATE

CRACKING WITH EFFLORESCENCE ALONG INSIDE EDGES OF RING

STONES (UNABLE TO VERIFY DURING INSPECTION).

60.1 MINOR EFFLORESCENCE ALONG BOTH BREASTWALLS.

60.5 1.3' DEEP SCOUR HOLE AT DOWNSTREAM SIDE OF NORTH

ABUTMENT; WITH MODERATE BANK EROSION.

60.6 HEAVY VEGETATION GROWTH ADJACENT TO WINGWALLS. MINOR

TO MODERATE DETERIORATION OF MASONRY MORTAR JOINTS.

MINOR EFFLORESCENCE AND HEAVY MOSS GROWTH ALSO

PRESENT.

60.6,9 MINOR TO MODERATE EROSION ALONG WEST WINGWALLS AND

NORTHWEST CORNER OF CHANNEL BED, UP TO 9". LARGE FALLEN

TREE ALONG SOUTHEAST WINGWALL. EROSION HOLE (1.5' D X 0.5'

W) AT SOUTHWEST WINGWALL END.

ABUTMENTS

BREASTWALLS OR COLUMNS1. G

PILE BENTS2. N

CAPS AND/OR BEARING SEATS3. N

BACKWALLS AND/OR BULKHEADS4. N

FOUNDATIONS5. G

WINGWALLS6. G

WEEP HOLES7. N

EXPANSION JOINTS8. N

EROSION AND/OR SCOUR9. F

SETTLEMENT OR DEFLECTION10. G

SLOPE PROTECTION11. N

OTHER 12. N

PIER(S)

WALLS AND/OR COLUMNS 13. N

PILE BENTS14. N

CAPS AND/OR BEARING SEATS15. N

FOUNDATIONS16. N

EROSION AND/OR SCOUR17. N

SETTLEMENT OR DEFLECTION18. N

OTHER 19. N

INSPECTION DATE: 5/11/14

STRUCTURE NO. 5460-019P FIELD INSPECTION REPORT

LAUREL CREEK BRIDGE #2

ITEM REFERENCE AND REMARKS

AVERAGE CLEAR OPENING 8.

7. NORMAL VELOCITY

ADEQUACY OF OPENING 6.

5. OTHER

4. WATERWAY OBSTRUCTIONS

CHANNEL PROTECTION3.

EROSION AND/OR SCOUR2.

ALIGNMENT1.

61. CHANNEL 6

F F N G N

MED

SUFF

7 FT.

9. STREAM BED COMPOSITION :

STONES, SILT

222. APPROACHES 7

OTHER 9.

ALIGNMENT 8.

SIGNS7.

SETTLEMENT 6.

EROSION5.

SURFACING4.

APPROACH GUARDRAIL 3.

2. RELIEF JOINTS

APPROACH SLABS1. N

N N G G G N G N

223. RETAINING WALL N

OTHER 6.

SETTLEMENT OR DEFLECTION5.

EROSION AND/OR SCOUR4.

FOUNDATION3.

WEEP HOLES2.

1. WALL

36. TRAFFIC AND SAFETY FEATURES

APPROACH GUARDRAIL ENDSD.

APPROACH GUARDRAILSC.

TRANSITIONSB.

BRIDGE RAILINGSA. 0

N N N

61.1,2 STREAM IS ALIGNED AT 45 DEGREES TO STRUCTURE OPENING

RESULTING IN STREAM FLOW AGAINST NORTH ABUTMENT.

MODERATE SLOUGHING OF NORTH CHANNEL BANKS; MINOR

ALONG SOUTH, UPSTREAM CHANNEL BANK. MODERATE SEDIMENT

ACCUMULATION NEAR SOUTH ABUTMENT.

61.2 SCOUR HOLE, UP TO 2.75', IN CHANNEL ABOUT 60' UPSTREAM OF

STRUCTURE.

61.4 PREVIOUSLY NOTED FALLEN TREE IN CHANNEL BENEATH BRIDGE

HAS BEEN REMOVED. MINOR DEBRIS ACCUMULATION IN

UPSTREAM CHANNEL. SEVERAL FALLEN TREES ALONG

DOWNSTREAM BANKS.

222.9 MINOR APPROACH EMBANKMENT SLIDE NEAR NORTHWEST

WINGWALL.

36.A PARAPET DOES NOT MEET CURRENT AASHTO HEIGHT

SPECIFICATIONS; EXISTING HEIGHTS ARE 1'-9" ES AND 2'-0" WS.

TRAFFIC SAFETY RATING CODES

N

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

Meets currently acceptable standards.

Not applicable or a safety feature is not required.

STRUCTURE LOAD RATING STRUCTURE NO. 5460-019P

TRUCK TYPE

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

TONS METRIC TONS TONS METRIC TONS

H 15 14 25 23

HS 19 17 31 28

TYPE 3 17 15 29 26

TYPE 3S2 25 23 41 37

TYPE 3-3 30 27 51 46

DESIGN LOADING: H15 (M13.5)

X CAPACITY MEETS OR EXCEEDS DESIGN LOAD

CAPACITY IS LESS THAN DESIGN LOAD

ORIGINAL LOAD RATING CALCULATION APPLICABLE

ORIGINAL LOAD RATING CALCULATION REVISED

DATE OF LOAD RATING CALCULATION:

LOAD RATING CONTROLLED BY:

REMARKS: RATING IS BASED ON DESIGN LOAD OF STRUCTURE.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5460-019P

STRUCTURE IDENTIFICATION

(201) PARK: GREAT SMOKY MOUNTAINS NATIONAL PARK

(202) STRUCTURE NAME: .......... LAUREL CREEK BRIDGE #2

(203) STRUCTURE KIND: ............ 1 - BRIDGE

(204) STRUCTURE NUMBER: ..... 5460-019P

(205) NPS REGION: .................... 4 - SOUTHEAST

(206) ROUTE CODE NUMBER: ... 15

(207) ROAD SECTION NO: .......... 019P

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD

(209) WITHIN NPS BNDRY?: ....... YES

(210) OPERATING UNIT: ............. N. DIST.

(211) PROJECT NO(S): ................ 3B2

(212) DRAWING NUMBERS: ....... 2009B

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

(22) OWNER: ............................... 66 - NATIONAL PARK SERVICE

(1) STATE:

(2) STATE HWY. AGENCY DIST:

(3) COUNTY CODE:

(4) CITY/PLACE CODE:

(5) INVENTORY ROUTE:

(6) FEATURES INTERSECTED:

(7) FACILITY CARRIED:

(8) STATE STRUCTURE NO:

(9) LOCATION:

(10) INV. RTE. - MIN. VERT. CLR: ..

(11) MILE POINT:

(27) YEAR BUILT:

(106) YEAR RECONSTRUCTED:

(20) TOLL:

(37) HISTORICAL DESIGNATION: ..

474 - TENNESSEE (TN)

155 - SEVIER

164000150

LAUREL CREEK

LAUREL CREEK ROAD

5460019P0000000

2.7 MI TO NPS ROUTE 16

99.99 FT (99.99 M)

2.70 (KM PT 4.35)

N/A

3 - FREE ROAD

3 - POSSIBLY 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:

1 - CONCRETE

11 - ARCH - DECK

51.0 FT (15.5 M)

51.0 FT (15.5 M)

2 - SPREAD FTG ON BEARING MAT'L

2 - SPREAD FTG ON BEARING MAT'L

6 - N/A

6 - N/A

N - NOT APPLICABLE

(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: .. N - NOT APPLICABLE

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

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

(218) IS SALT USED?: ..................... YES

LOAD RATING AND POSTING

(31) DESIGN LOAD: ................. 2 - H15 (M13.5) (41) LOAD RESTRICTION: ......... A - OPEN, NO RESTRICTION

(66) INVENTORY RATING: ...... 19.0 TONS (17.2 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 31.0 TONS (28.1 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 5/14 (91) FREQ. OF INSP: 48 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):

(219) ADD. STUDIES NEEDED: N - 0 - NONE (A) FRACTURE CRITICAL: ... NO

INSP. EVERY: MONTHS - LAST INSP. : (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. 5460-019P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE: ............................. 35°38'15.20" (51) CURB TO CURB WIDTH: ........... 34.0 FT (10.4 M)

(17) LONGITUDE: ......................... 83°43'18.50" (52) DECK WIDTH: ............................ 39.0 FT (11.9 M)

(19) DETOUR LENGTH: ............... 50 MI (80 KM) (32) APPR. ROADWAY WIDTH: ........ 34.0 FT (10.4 M)

(28A) LANES ON STRUCT: .......... 02 (213) APPR. PAVEMENT WIDTH: ..... 23.0 FT (7.0 M)

(28B) LANES UNDER STRUCT: ... 00 LEFT SHOULDER: .................. 4.0 FT (1.2 M)

(42A) SERVICE ON: ..................... 1 - HIGHWAY RIGHT SHOULDER: ................ 7.0 FT (2.1 M)

(42B) SERVICE UNDER: .............. 5 - WATERWAY (33) BRIDGE MEDIAN: ....................... 0 - NO MEDIAN

(29) AVG. DAILY TRAFFIC: .......... 3060 (34) SKEW ANGLE: ............................ 43 °

(30) YEAR OF ADT: ...................... 2010 (35) DECK FLARE?: ........................... NO

(114) FUTURE ADT: ..................... 3366 (47) TOTAL HORIZ. CLEARANCE: .... 34.0 FT (10.4 M)

(115) YEAR OF FUTURE ADT: ..... 2030 (50) SIDEWALKS:

(101) PARALLEL STRUCTURE: ... N - NONE LEFT : ...................................... 0.0 FT (0.0 M)

(38) NAVIGATION CONTROL?: ... 0 RIGHT : ................................... 0.0 FT (0.0 M)

(39) VERTICAL CLEARANCE: ...... 0.0 FT (0.0 M) (214) BRIDGE RAIL TYPE:

(40) HORIZ. CLEARANCE: ........... 0.0 FT (0.0 M) RAIL CONFIGURATION: ......... 3 - PARAPET ONLY

(111) ABUT. OR PIER PROT: ....... MATERIAL: .............................. 9 - OTHER

DESIGN TYPE: ........................ 1 - CONTINUOUS RAIL

LATERAL UNDERCLEARANCE:

(55) RIGHT: ....................... 99.9 FT (99.9 M) (215) BRIDGE RAIL HEIGHT: ............ 1.75 FT (0.53 M)

(56) LEFT: ......................... 0.0 FT (0.0 M) (53) MIN. VRT. CLEAR. OVER DECK: 99.99 FT (99.99 M)

(54) MIN. VRT. UNDERCLEARANCE: 0.00 FT (0.00 M)

CONDITION AND APPRAISAL DATA, PROPOSED IMPROVEMENTS, AND COST

(58) DECK: ................................. N

(59) SUPERSTRUCTURE:

(60) SUBSTRUCTURE:

(61) CHANNEL:

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

(222) APPROACHES:

(223) RETAINING WALL: ........... N

(36) TRAFFIC SAFETY FEAT: ... 0NNN

(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

8 - Stable; scour above top of fo

1 - MAINTENANCE

D - MINOR

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

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APPENDIX STRUCTURE NO. 5460-019P

PHOTOGRAPHS STRUCTURE NO. 5460-019P

PHOTO #1 - LOOKING SOUTH TOWARD CADES COVE

FLOW

PHOTO #2 - WEST (UPSTREAM) SIDE

PHOTO #3 - GENERAL TOPSIDE VIEW LOOKING SOUTH

PHOTO #4 - GENERAL UNDERSIDE VIEW LOOKING WEST

PHOTO #5 - GENERAL VIEW OF SOUTHBOUND

LANE; PREVIOUSLY NOTED DROP-OFF HAS

BEEN REPAIRED

PHOTO #6 - DROP-OFF ALONG SOUTHBOUND

LANE

PHOTO #7 - REPAIRS TO SOUTH PORTION OF

DROP-OFF ALONG SOUTHBOUND LANE

PHOTO #8 - TYPICAL CONDITION OF PARAPET

MORTAR JOINTS, EAST PARAPET SHOWN

PHOTO #9 - TYPICAL CRACKING WITH

EFFLORESCENCE ALONG RING STONES, EAST

SIDE SHOWN

PHOTO #10 - TYPICAL CRACKING WITH

EFFLORESCENCE ALONG RING STONES,

WEST SIDE SHOWN; NOTE CRACKING WITH

EFFLORESCENCE ON ARCH UNDERSIDE AT

SOUTH ABUTMENT

PHOTO #11 - FALLEN TREE BENEATH BRIDGE

HAS BEEN REMOVED

PHOTO #12 - EFFLORESCENCE ALONG

CONSTRUCTION JOINT

PHOTO #13 - GENERAL VIEW OF NORTH ABUTMENT

PHOTO #14 - MOSS AND VINE GROWTH ON NORTHEAST WINGWALL

PHOTO #15 - SCOUR HOLE AT DOWNSTREAM SIDE OF NORTH

ABUTMENT

PHOTO #16 - SLOUGHING ALONG NORTH, UPSTREAM CHANNEL BANK

AT ABUTMENT

PHOTO #17 - EROSION ALONG SOUTHWEST WINGWALL

PHOTO #18 - EROSION HOLE AT SOUTHWEST WINGWALL END

PHOTO #19 - LOOKING UPSTREAM THROUGH STRUCTURE

PHOTO #20 - LOOKING DOWNSTREAM THROUGH STRUCTURE