Bridge_Inspection_Report_5460-017P_West_Prong_Little_River_Bridge.pdf

BRIDGE INSPECTION REPORT

WEST PRONG LITTLE RIVER BRIDGE

LAUREL CREEK ROAD OVER WEST PRONG LITTLE RIVER

GREAT SMOKY MOUNTAINS NATIONAL PARK

LS

STRUCTURE NO. 5460-017P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 5/17/16

EUReport prepared by:

Federal Highway Administration FLH Office of Bridges and Structures 21400 Ridgetop Circle Sterling, VA 20166 703-404-6201 https://bridge.flhd.fhwa.dot.gov http:https://bridge.flhd.fhwa.dot.gov

STRUCTURE NO. 5460 017P

WEST PRONG LITTLE RIVER BRIDGE INSPECTION DATE: 5/17/16

STRUCTURE SUMMARY

BRIDGE IDENTIFICATION AND DESCRIPTION

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

CONCRETE 1

MAIN SPAN TYPE: ............... NO. OF APPR. SPANS: ........ ARCH - DECK 0

# OF BEAMS, MAIN SPAN: .. 1 STRUCT. TOTAL LENGTH: .. 48.2 FT (14.7 M)

DECK TYPE: ......................... NOT APPLICABLE MAX. SPAN LENGTH: .......... 48.2 FT (14.7 M)

WEARING SURFACE: .......... NOT APPLICABLE DECK WIDTH: ...................... 36.5 FT (11.1 M)

ABUT. FOUNDATIONS: ........ SPREAD FTG ON BEARING MAT'L CURB TO CURB WIDTH: ..... 32.0 FT (9.8 M)

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

ABUTMENT / PIER MAT'L: ... CONCRETE YEAR RECONSTRUCTED: .. N/A

PROJ./PLAN REF. NO: ......... SKEW ANGLE: ..................... 24 °

NPS ROAD CLASS:

3B1 / 1571

FRACTURE CRITICAL: ........ NO

STRUCTURE HISTORY: ...... 2002-ROADWAY AND APPROACHES RESURFACED.

1 - PRINCIPAL PARK ROAD

LOCATION

GREAT SMOKY MOUNTAINS NATIONAL PARK MILE POINT: ..................... 2.10 (KM PT 3.38)

TE: ................................. TION: 5.7 MI

STA TENNESSEE LOCA TO CADES COVE

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

FEATURE INTERSECTED: .. WEST PRONG LITTLE RIVER

STRUCTURE EVALUATION SUMMARY

This concrete arch bridge is in fair condition overall. The main problem is that the stream flow is primarily directed against the north abutment, resulting in scaling of the concrete and moderate scour of the west side of the north abutment, exposing the footing. Other problems include moderate deterioration of the arch underside, parapets, and wingwalls; a large tree growing in the center of the downstream channel; and lack of object markers at the parapet ends.

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

INSPECTION TEAM: G. GOODLIN, H. SALAD

CONDITION ASSESSMENT:

GARY J. GOODLIN, FIELD TEAM LEADER 703-404-6253

REPORT REVIEW:

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

REPORT APPROVAL: DATE: 9/30/16

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

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5460 017P

226 PRIORITY OF IMPROVEMENT C

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.

ITEM

NO.

MAINTENANCE RECOMMENDATIONS

(GENERALLY NOT FLHP ELIGIBLE)

QTY. UNIT COST

UNIT

ESTIMATE

COST

PRELIM.

61.4 REMOVE LARGE TREE IN CENTER OF DOWNSTREAM CHANNEL. 1 LS

222.7 INSTALL TYPE 3 REFLECTIVE OBJECT MARKERS AT BRIDGE CORNERS. 4 EA

PRELIM. MAINTENANCE TOTAL :

ITEM

REHABILITATION/RECONSTRUCTION

QTY. UNIT

UNIT

COST ESTIMATES

PRELIM. COST

NO (TYPICALLY NEEDED WITHIN 5 YEARS)

REHAB. RECONSTR.

58.6, 60.6 REMOVE VEGETATION FROM WINGWALLS AND PARAPETS AND

REPOINT MASONRY MORTAR JOINTS AS NECESSARY.

1 LF

60.9 REPAIR SCOUR AND UNDERMINING AT NORTH ABUTMENT WITH

ENGINEERED RIPRAP.

1 LS

CONTRACT COSTS FOR MOBILIZATION, TRAFFIC CONTROL, AND

DESIGN CONSTRUCTION ENGINEERING (70% TOTAL REHAB COST)

PLUS PARK LOCATION FACTOR.

1 LS

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

FIELD INSPECTION REPORT STRUCTURE NO. 5460 017P

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

N

NOT APPLICABLE

EXCELLENT CONDITION

VERY GOOD CONDITION - no problems noted.

GOOD CONDITION - some minor problems.

SATISFACTORY CONDITION - structural elements show some minor deterioration.

FAIR CONDITION - all primary structural elements are sound but may have minor section loss, cracking, spalling, or scour.

POOR CONDITION - advanced section loss, deterioration, spalling, or scour.

SERIOUS CONDITION - loss of section, deterioration, spalling, or scour have seriously affected primary structural components. Local failures are possible.

Fatigue cracks in steel or shear cracks in concrete may be present.

CRITICAL CONDITION - advanced deterioration of primary structural elements. Fatigue cracks in steel or shear cracks in concrete may be present or scour may have removed substructure support. Unless closely monitored it may be necessary to close the structure until corrective action can be taken.

“IMMINENT” FAILURE CONDITION - major deterioration or section loss present in critical structural components or obvious vertical or horizontal movement affecting structure stability. Structure is closed to traffic but corrective action may return structure to light service.

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

DECK SLAB1. N

EXPANSION JOINTS2. N

WEARING SURFACE3. G

RIDEABILITY4. G

CURBS, SIDEWALKS, AND MEDIAN5. N

PARAPETS AND/OR RAILINGS6. F

DRAINS AND DRAINAGE7. G

UTILITIES8. G

DEFLECTION AND/OR VIBRATION9. G

OTHER10. (PAVEMENT MARKINGS) F

59. SUPERSTRUCTURE 6

BEARING DEVICES1. N

GIRDERS OR BEAMS2. N

ARCH(ES) OR SLAB(S)3. F

FLOOR BEAMS AND STRINGERS4. N

TRUSSES5. N

DIAPHRAGMS AND BRACING6. N

7. PAINT N

FASCIA(E)8. N

DEFLECTION AND/OR VIBRATION9. G

ALIGNMENT10. N

OTHER11. N

60. SUBSTRUCTURE 6

ITEM REFERENCE AND REMARKS

ABUTMENTS

58.6 MODERATE DETERIORATION OF PARAPET MASONRY MORTAR

JOINTS WITH VEGETATION AND MOSS GROWTH.

58.8 UTILITY LINE INSTALLED THROUGH SHOULDER ON EAST SIDE;

UTILITY BOX LOCATED OFF NORTH ABUTMENT.

58.10, 222.9 MINOR FADING OF PAVEMENT MARKINGS.

59.3 MINOR TO MODERATE LONGITUDINAL CRACKING OF ARCH

UNDERSIDE WITH EFFLORESCENCE AT SEVERAL LOCATIONS.

MODERATE EFFLORESCENCE ON MASONRY RING STONES.

60.1 MINOR TO MODERATE VERTICAL AND HORIZONTAL CRACKING WITH

EFFLORESCENCE ON ABUTMENT BREASTWALLS; MODERATE

DIAGONAL CRACKING AT ENDS. MODERATE SCALING ON

CONCRETE ALONG BOTTOM OF NORTH ABUTMENT BREASTWALL.

2' X 3' DELAMINATED AREA AT EAST END OF NORTH ABUTMENT.

60.5,9, 61.1,2,4

SILT AND DEBRIS ACCUMULATION ON WEST SIDE AND ALONG

SOUTH ABUTMENT IS DIVERTING FLOW TOWARD NORTH

ABUTMENT, CAUSING MODERATE SCOUR WITH FOOTING EXPOSED

12" HIGH AT WEST SIDE. WATER FLOWING UNDER BOTTOM RING

STONE UP TO 4' BACK UNDER STONES. MINOR SCALING ON NORTH

ABUTMENT FOUNDATION AT WATERLINE.

MINOR EROSION AT END OF NORTHWEST WINGWALL WITH 25"

DEEP VOID.

30" DEEP VOID IN SLOPE ADJACENT TO NORTHWEST WINGWALL.

MINOR SLOUGHING OF WEST CHANNEL BANK, NORTH SIDE.

60.6 MODERATE EFFLORESCENCE AND LEAKAGE THROUGH WINGWALL

JOINTS. MINOR VEGETATION AND MOSS GROWTH ON WINGWALLS.

MINOR DETERIORATION OF MASONRY MORTAR JOINTS AT

WATERLINE ON ALL WINGWALLS; MODERATE THROUGHOUT

NORTHWEST WINGWALL.

1. BREASTWALLS OR COLUMNS F

2. PILE BENTS N

3. CAPS AND/OR BEARING SEATS N

4. BACKWALLS AND/OR BULKHEADS N

5. FOUNDATIONS G

6. WINGWALLS F

7. WEEP HOLES F

8. EXPANSION JOINTS N

9. EROSION AND/OR SCOUR F

10. SETTLEMENT OR DEFLECTION G

11. SLOPE PROTECTION N

12. OTHER N

PIER(S)

N13. WALLS AND/OR COLUMNS

N14. PILE BENTS

N15. CAPS AND/OR BEARING SEATS

N16. FOUNDATIONS

N17. EROSION AND/OR SCOUR

N18. SETTLEMENT OR DEFLECTION

N19. OTHER

FIELD INSPECTION REPORT STRUCTURE NO. 5460 017P

AND REMARKSITEM REFERENCE

61. CHANNEL 5

F 1. ALIGNMENT

F2. EROSION AND/OR SCOUR

N 3. CHANNEL PROTECTION

F 4. WATERWAY OBSTRUCTIONS

N 5. OTHER

SUFF ADEQUACY OF OPENING 6.

7. MEDNORMAL VELOCITY

13 FT. 8. AVERAGE CLEAR OPENING

9. STREAM BED COMPOSITION :

STONES, SILT

222. APPROACHES 7

OTHER 9.

ALIGNMENT 8.

SIGNS7.

SETTLEMENT6.

EROSION5.

SURFACING 4.

APPROACH GUARDRAIL 3.

RELIEF JOINTS 2.

APPROACH SLABS 1. N

N

N

G

G

G

N

G

F

223. RETAINING WALL

(PAVEMENT MARKINGS)

N

OTHER6.

SETTLEMENT OR DEFLECTION5.

EROSION AND/OR SCOUR 4.

FOUNDATION 3.

WEEP HOLES 2.

WALL1.

36. TRAFFIC AND SAFETY FEATURES

APPROACH GUARDRAIL ENDSD.

APPROACH GUARDRAILSC.

TRANSITIONSB.

BRIDGE RAILINGSA. 0

N N N

60.7 SOUTH ABUTMENT WEEP HOLES BURIED.

61.2 SCOUR HOLE, UP TO 2' DEEP, DOWNSTREAM CORNER OF NORTH

ABUTMENT.

61.4 LARGE TREE GROWING IN CENTER OF DOWNSTREAM CHANNEL.

222.5 MINOR SLOPE FAILURE ADJACENT TO SOUTHWEST WINGWALL.

MINOR TO MODERATE DEBRIS AGAINST WINGWALL.

36.A PARAPET HEIGHT DOES NOT MEET CURRENT AASHTO HEIGHT

SPECIFICATION OF 2'-3" FOR TRAFFIC BARRIERS.

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 017P

TRUCK TYPE

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

TONS METRIC TONS TONS METRIC TONS

H 15 14 25 23

HS 19 17 32 29

TYPE 3 18 16 30 27

TYPE 3S2 28 25 47 43

TYPE 3-3 34 31 57 52

DESIGN LOADING: UNKNOWN (H15 ASSUMED - SEE REMARKS)

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: DESIGN LOADING ASSUMPTION IS BASED ON STRUCTURE TYPE, LOCATION, AGE, AND CONDITION.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5460 017P

STRUCTURE IDENTIFICATION

(201) PARK: GREAT SMOKY MOUNTAINS NATIONAL PARK

(202) STRUCTURE NAME: .......... WEST PRONG LITTLE RIVER BRIDGE

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

(204) STRUCTURE NUMBER: ..... 5460-017P

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

(206) ROUTE CODE NUMBER: ... 15

(207) ROAD SECTION NO: ..........017P

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

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

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

(211) PROJECT NO(S): ................ 3B1

(212) DRAWING NUMBERS:

(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)

009 - BLOUNT

164000150

WEST PRONG LITTLE RIVER

LAUREL CREEK ROAD

5460017P0000000

5.7 MI TO CADES COVE

99.99 FT (99.99 M)

2.10 (KM PT 3.38)

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

48.2 FT (14.7 M)

48.2 FT (14.7 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

YES(218) IS SALT USED?:

LOAD RATING AND POSTING

(31) DESIGN LOAD:

0 - UNKNOWN (41) LOAD RESTRICTION:

A - OPEN, NO RESTRICTION

(66) INVENTORY RATING: ...... 19.0 TONS (17.0 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 32.0 TONS (29.0 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 5/16 (91) FREQ. OF INSP: 24 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 017P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE: ............................. 35°38'24.30" (51) CURB TO CURB WIDTH: ........... 32.0 FT (9.8 M)

(17) LONGITUDE: ......................... 83°42'57.70" (52) DECK WIDTH: ............................ 36.5 FT (11.1 M)

(19) DETOUR LENGTH: ............... 50 MI (80 KM) (32) APPR. ROADWAY WIDTH: ........ 32.0 FT (9.8 M)

(28A) LANES ON STRUCT: .......... 02 (213) APPR. PAVEMENT WIDTH: ..... 21.0 FT (6.4 M)

(28B) LANES UNDER STRUCT: ... 00 LEFT SHOULDER: .................. 5.5 FT (1.7 M)

(42A) SERVICE ON: ..................... 1 - HIGHWAY RIGHT SHOULDER: ................ 5.5 FT (1.7 M)

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

(29) AVG. DAILY TRAFFIC: .......... 3060 (34) SKEW ANGLE: ............................ 24 °

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

(114) FUTURE ADT: ..................... 3366 (47) TOTAL HORIZ. CLEARANCE: .... 32.0 FT (9.8 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: ....................... 0.0 FT (0.0 M) (215) BRIDGE RAIL HEIGHT: ............ 2.17 FT (0.66 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

4 - Stable; action required to pro

2 - REHAB/RECONSTRUCTION

C - MODERATE

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

2002-ROADWAY AND APPROACHES RESURFACED.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

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APPENDIX STRUCTURE NO. 5460 017P

PHOTOGRAPHS STRUCTURE NO. 5460 017P

FLOW

PHOTO #1 - LOOKING NORTH TOWARD GATLINBURG

PHOTO #2 - WEST (DOWNSTREAM) SIDE

PHOTO #3 - GENERAL TOPSIDE VIEW LOOKING SOUTH

PHOTO #4 - GENERAL UNDERSIDE VIEW LOOKING SOUTH; NOTE

LONGITUDINAL CRACKING WITH EFFLORESCENCE ON ARCH

UNDERSIDE

STRUCTURE NO. 5460 017PPHOTOGRAPHS

PHOTO #5 - TYPICAL DETERIORATION OF

PARAPET MASONRY MORTAR JOINTS WITH

VEGETATION AND MOSS GROWTH, WEST

PARAPET AT MID SPAN SHOWN

PHOTO #6 - TYPICAL EFFLORESCENCE ON

MASONRY RING STONES, WEST SIDE SHOWN

PHOTO #7 - TYPICAL LONGITUDINAL CRACKING WITH

EFFLORESCENCE ON ARCH UNDERSIDE

PHOTO #8 - GENERAL VIEW OF NORTH ABUTMENT

PHOTO #9 - DELAMINATED AREA AT EAST END

OF NORTH ABUTMENT.

PHOTO #10 - TYPICAL VERTICAL AND

HORIZONTAL CRACKING WITH

EFFLORESCENCE ON ABUTMENT

BREASTWALLS, SOUTH ABUTMENT SHOWN

PHOTO #11 - SCALING ON NORTH ABUTMENT BREASTWALL AT

WATERLINE

PHOTO #12 - SCOUR WITH FOOTING EXPOSED AT WEST CORNER OF

NORTH ABUTMENT; NOTE WATER FLOWING UNDER BOTTOM RING

STONE

PHOTO #13 - SCOUR WITH FOOTING EXPOSED AT WEST CORNER OF

NORTH ABUTMENT; NOTE WATER FLOWING UNDER BOTTOM RING

STONE

PHOTO #14 - SCOUR HOLE AT DOWNSTREAM CORNER OF NORTH

ABUTMENT

PHOTO #15 - LARGE TREE GROWING IN

CENTER OF DOWNSTREAM CHANNEL

PHOTO #16 - LOOKING UPSTREAM THROUGH

STRUCTURE

PHOTO #17 - LOOKING DOWNSTREAM THROUGH STRUCTURE