5570-502P6875.pdf

STRUCTURE SUMMARY STRUCTURE NO. 5570-502P

BOGUE CHITTO BRIDGE INSPECTION DATE: 10/5/17

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:

P/S CONCRETE CONTINUOUS

STRINGER/MULTI-BEAM or GIRDER

CONCRETE CAST-IN-PLACE

BITUMINOUS

SPREAD FOOTING ON PILES

SPREAD FTG ON BEARING MAT'L

CONCRETE

NATR 3P9 / B0116

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:

500.3 FT (152.5 M)

100.1 FT (30.5 M)

37.1 FT (11.3 M)

34.7 FT (10.6 M)

N/A

0 °

N/A

LOCATION

NATCHEZ TRACE PARKWAY MILE POINT: ..................... 91.40 (KM PT 147.09)

STATE: ................................. MISSISSIPPI LOCATION: 3.86 MILES NORTH OF I-20

FACILITY CARRIED: ............ NATCHEZ TRACE PARKWAY

FEATURE INTERSECTED: .. BOGUE CHITTO

STRUCTURE EVALUATION SUMMARY

This continuous prestressed concrete multi-girder bridge is in good condition overall. Problems include deterioration of the relief joint sealant at the approaches; debris accumulation in the expansion joints; water ponding at the bridge ends, particularly at the ends of the expansion joints; and minor to moderate cracking of the wearing surface and the pavement at the approaches.

It should also be noted that the closure diaphragms have areas of minor delamination and spalling and the slopes around the piers and along the channel banks have minor to moderate erosion. These conditions will continue to be monitored during future inspections.

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: P. JORDAN (SEH), M. COEN (GEOCAL)

CONDITION ASSESSMENT:

PAUL J. JORDAN, P.E., FIELD TEAM LEADER

REPORT REVIEW:

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

REPORT APPROVAL: DATE: 2/28/18

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

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5570-502P

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.

D226 PRIORITY OF IMPROVEMENT

ITEM

NO.

ROUTINE MAINTENANCE QTY. UNIT COST

UNIT

ESTIMATE

COST

PRELIM.

58.3, 222.4 CLEAN AND SEAL CRACKING OF ASPHALT WEARING SURFACE OVER STRUCTURE

AND PAVEMENT AT APPROACHES.

222.2 CLEAN AND RESEAL RELIEF JOINTS AT APPROACHES.

58.2,7 PERIODICALLY CLEAN DEBRIS AND VEGETATION GROWTH FROM EXPANSION

JOINTS AND CURBLINES.

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 :

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. 5570-502P

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

CONDITION RATING CODE EQUIVALENTS FOR SUB-ELEMENTS

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 CODES FOR ITEMS 58 - 62, 222, 223

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.

N

58. DECK ITEM REFERENCE AND REMARKS

OTHER

ALIGNMENT

DEFLECTION AND/OR VIBRATION

FASCIA(E)

DIAPHRAGMS AND BRACING

TRUSSES

FLOOR BEAMS AND STRINGERS

ARCH(ES) OR SLAB(S)

GIRDERS OR BEAMS

BEARING DEVICES

59. SUPERSTRUCTURE

OTHER

DEFLECTION AND/OR VIBRATION

UTILITIES

DRAINS AND DRAINAGE

PARAPETS AND/OR RAILINGS

CURBS, SIDEWALKS, AND MEDIAN

RIDEABILITY

WEARING SURFACE

EXPANSION JOINTS

DECK SLAB

ABUTMENTS

60. SUBSTRUCTURE

1.

10.

2.

3.

4.

5.

6.

7.

8.

9.

10.

9.

8.

7.

6.

5.

4.

3.

2.

1.

PAINT

11.

G G N N N F N N G

N G

F G F F F N

N

F

G

G

58.1 DECK SURFACE COVERED WITH WEARING SURFACE, AND STAY IN

PLACE FORMS PRESENT ON UNDERSIDE. MINOR TRANSVERSE

CRACKING WITH EFFLORESCENCE ON OVERHANGS. FEW

SQUARES OF STEEL FORMS CUTOUT.

58.2 EXPANSION JOINTS AT ABUTMENTS FILLED WITH DIRT AND DEBRIS;

MINOR VEGETATION GROWTH IN SHOULDERS.

58.3, 222.4 MINOR TO MODERATE RANDOM, TRANSVERSE, AND LONGITUDINAL

CRACKING OF WEARING SURFACE AND APPROACHES.

58.5,6 MINOR TO MODERATE CRACKING OF CURBS AND RAILINGS

THROUGHOUT, SOME WITH EFFLORESCENCE. MINOR VEHICLE

SCRAPES ON CURBS AT ISOLATED LOCATIONS.

58.7 EVIDENCE OF WATER PONDING ALONG CURBS AT NORTH AND

SOUTH ENDS OF BRIDGE, PARTICULARLY AT EXPANSION JOINT

ENDS (NOT OBSERVED DUE TO DRY CONDITIONS). MINOR TO

MODERATE DEBRIS ACCUMULATION AND VEGETATION GROWTH IN

CURBLINES.

59.6 MINOR VERTICAL CRACKING ON EXTERIOR FACE OF CLOSURE

DIAPHRAGMS AT PIERS. MINOR DELAMINATION (UP TO 2'W X 2'H)

OF CLOSURE DIAPHRAGMS AT PIERS AT ISOLATED LOCATIONS.

MINOR SPALLING OF CLOSURE DIAPHRAGM ON EXTERIOR SIDE OF

GIRDER #4 AT NORTH ABUTMENT.

60.1 MINOR VERTICAL CRACKING OF ABUTMENT BREASTWALLS.

60.6 MINOR CRACKING WITH EFFLORESCENCE ON WINGWALLS. MINOR

DELAMINATION AND SPALLING OF FINISH COAT ON SOUTHWEST

WINGWALL.

BREASTWALLS OR COLUMNS 1. G

PILE BENTS 2. N

CAPS AND/OR BEARING SEATS 3. G

BACKWALLS AND/OR BULKHEADS 4. G

FOUNDATIONS 5. N

WINGWALLS 6. G

WEEP HOLES 7. N

EXPANSION JOINTS 8. N

EROSION AND/OR SCOUR 9. G

SETTLEMENT OR DEFLECTION 10. G

SLOPE PROTECTION 11. G

OTHER 12. N

PIER(S)

WALLS AND/OR COLUMNS 13. G

PILE BENTS 14. N

CAPS AND/OR BEARING SEATS 15. G

FOUNDATIONS 16. N

EROSION AND/OR SCOUR 17. F

SETTLEMENT OR DEFLECTION 18. G

OTHER 19. N

FIELD INSPECTION REPORT STRUCTURE NO. 5570-502P

ITEM REFERENCE AND REMARKS

STREAM BED COMPOSITION :9.

AVERAGE CLEAR OPENING 8.

NORMAL VELOCITY 7.

ADEQUACY OF OPENING 6.

OTHER5.

WATERWAY OBSTRUCTIONS 4.

CHANNEL PROTECTION 3.

EROSION AND/OR SCOUR 2.

ALIGNMENT 1.

61. CHANNEL 5

F F G F N

LOW

SUFF

7 FT.

STONES, CLAY

222. APPROACHES 6

OTHER 9.

ALIGNMENT 8.

SIGNS 7.

SETTLEMENT 6.

EROSION 5.

SURFACING 4.

APPROACH GUARDRAIL 3.

RELIEF JOINTS 2.

1. APPROACH SLABS N

F N F G G G G N

223. RETAINING WALL N

OTHER 6.

SETTLEMENT OR DEFLECTION 5.

EROSION AND/OR SCOUR 4.

FOUNDATION 3.

WEEP HOLES 2.

1. WALL

36. TRAFFIC AND SAFETY FEATURES

APPROACH GUARDRAIL ENDS D.

APPROACH GUARDRAILS C.

TRANSITIONS B.

BRIDGE RAILINGSA. 1

N N N

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.

61.2 SEE BRIDGE FILE FOR SCOUR EVALUATION.

60.11 RIPRAP SLOPE PROTECTION AT ABUTMENTS.

60.15 MINOR VERTICAL CRACKING OF PIER CAPS AT ISOLATED

LOCATIONS.

60.17 MINOR EROSION OF SLOPE AROUND PIERS; MODERATE (UP TO 4'D)

AT PIERS #1, #2 AND #4.

61.1 CHANNEL BENDS 45 DEGREES TOWARD NORTH AT UPSTREAM AND

DOWNSTREAM.

61.2 MODERATE EROSION AND UNDERMINING OF CHANNEL BANKS

BELOW STRUCTURE IN SPAN #2.

61.4 MINOR ACCUMULATION OF DEBRIS IN UPSTREAM AND

DOWNSTREAM CHANNELS.

222.2 PAVEMENT SAW CUT AND SEALED AT APPROACH ENDS OF

APPROACH SLABS; DETERIORATION OF SEALANT THROUGHOUT

AND MISSING IN SOME LOCATIONS.

222.7 5"X16" BLACK AND YELLOW STRIPED OBJECT MARKERS PRESENT

AT ENDS OF RAILINGS.

STRUCTURE LOAD RATING STRUCTURE NO. 5570-502P

TRUCK TYPE

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

TONS METRIC TONS TONS METRIC TONS

H 24 22 40 36

HS 36 32 60 54

TYPE 3 34 31 57 52

TYPE 3S2 41 37 68 62

TYPE 3-3 45 41 75 68

DESIGN LOADING: HS20 (MS18)

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.

SEE BRIDGE FILE FOR LOAD RATING CALCULATIONS.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5570-502P

STRUCTURE IDENTIFICATION

(201) PARK: NATCHEZ TRACE PARKWAY (1) STATE: ....................................... 284 - MISSISSIPPI (MS)

(202) STRUCTURE NAME: .......... BOGUE CHITTO BRIDGE (2) STATE HWY. AGENCY DIST:

(203) STRUCTURE KIND: ............ 1 - BRIDGE (3) COUNTY CODE: ........................ 049 - HINDS

(204) STRUCTURE NUMBER: ..... 5570-502P (4) CITY/PLACE CODE:

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

(206) ROUTE CODE NUMBER: ... 1 (6) FEATURES INTERSECTED:....... BOGUE CHITTO

(207) ROAD SECTION NO: .......... 502P (7) FACILITY CARRIED: .................. NATCHEZ TRACE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5570502P0000000

(209) WITHIN NPS BNDRY?: ....... YES (9) LOCATION: ................................ 3.86 MILES NORTH OF I-20

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

(211) PROJECT NO(S): ................ NATR 3P9 (11) MILE POINT: ............................. 91.40 (KM PT 147.09)

(212) DRAWING NUMBERS: ....... B0116 (27) YEAR BUILT:

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

(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:

6 - P/S CONCRETE CONTINUOUS

02 - STRINGER/MULTI-BEAM or GIRDER

100.1 FT (30.5 M)

500.3 FT (152.5 M)

3 - SPREAD FOOTING ON PILES

3 - SPREAD FOOTING ON PILES

2 - SPREAD FTG ON BEARING MAT'L

2 - SPREAD FTG ON BEARING MAT'L

1 - CONCRETE CAST-IN-PLACE

(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: .. 6 - BITUMINOUS

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

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

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

LOAD RATING AND POSTING

(31) DESIGN LOAD: ................. 5 - HS20 (MS18) (41) LOAD RESTRICTION: ......... R - POSTED (OTHER)

(66) INVENTORY RATING: ...... 35.8 TONS (32.4 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 59.7 TONS (54.2 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 10/17 (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:

(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. 5570-502P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE: ............................. 32°22'13.20" (51) CURB TO CURB WIDTH: ........... 34.7 FT (10.6 M)

(17) LONGITUDE: ......................... 90°17'02.70" (52) DECK WIDTH: ............................ 37.1 FT (11.3 M)

(19) DETOUR LENGTH: ............... 0 MI (0 KM) (32) APPR. ROADWAY WIDTH: ........ 34.0 FT (10.4 M)

(28A) LANES ON STRUCT: .......... 02 (213) APPR. PAVEMENT WIDTH: ..... 22.0 FT (6.7 M)

(28B) LANES UNDER STRUCT: ... 00 LEFT SHOULDER: .................. 6.0 FT (1.8 M)

(42A) SERVICE ON: ..................... 1 - HIGHWAY RIGHT SHOULDER: ................ 6.0 FT (1.8 M)

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

(29) AVG. DAILY TRAFFIC: .......... 9100 (34) SKEW ANGLE: ............................ 0 °

(30) YEAR OF ADT: ...................... 2013 (35) DECK FLARE?: ........................... NO

(114) FUTURE ADT: ..................... 10920 (47) TOTAL HORIZ. CLEARANCE: .... 34.7 FT (10.6 M)

(115) YEAR OF FUTURE ADT: ..... 2033 (50) SIDEWALKS:

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

(38) NAVIGATION CONTROL?: ... N 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: ......... 1 - FULL HEIGHT (NO PARAPE

(111) ABUT. OR PIER PROT: ....... 1 - NAV PROTECTION NOT REQUIRED MATERIAL: .............................. 1 - CONCRETE

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

LATERAL UNDERCLEARANCE:

(55) RIGHT: ....................... 0.0 FT (0.0 M) (215) BRIDGE RAIL HEIGHT: ............ 2.66 FT (0.81 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:

(59) SUPERSTRUCTURE:

(60) SUBSTRUCTURE:

(61) CHANNEL:

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

(222) APPROACHES:

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

(36) TRAFFIC SAFETY FEAT: ... 1NNN

(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

5 - Stable; scour within limits of

1 - MAINTENANCE

D - MINOR

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

APPENDIX STRUCTURE NO. 5570-502P

PHOTOGRAPHS STRUCTURE NO. 5570-502P

PHOTO #1 - LOOKING SOUTHBOUND TOWARD NATCHEZ

FLOW

PHOTO #2 - EAST (UPSTREAM) SIDE

PHOTO #3 - GENERAL TOPSIDE VIEW LOOKING NORTH

PHOTO #4 - TYPICAL ACCUMULATION OF DIRT AND DEBRIS IN

EXPANSION JOINTS AT ABUTMENTS, EXPANSION JOINT AT SOUTH

ABUTMENT SHOWN

PHOTO #5 - TYPICAL CRACKING OF WEARING SURFACE, SPAN #3

SHOWN

PHOTO #6 - TYPICAL CRACKING OF CURBS, WEST CURB OVER PIER #4

PHOTO #7 - TYPICAL DEBRIS ACCUMULATION AND VEGETATION

GROWTH IN CURBLINES, EAST CURBLINE NEAR SOUTH END SHOWN

PHOTO #8 - TYPICAL DETERIORATION OF RELIEF JOINT SEALANT,

NORTH APPROACH RELIEF JOINT SHOWN

PHOTO #9 - TYPICAL CRACKING OF APPROACH PAVEMENT, SOUTH

APPROACH SHOWN

PHOTO #10 - GENERAL UNDERSIDE VIEW LOOKING SOUTH, SPAN #2

PHOTO #11 - TYPICAL CRACKING WITH EFFLORESCENCE ON DECK

OVERHANGS WEST SIDE AT PIER #4 SHOWN

PHOTO #12 - TYPICAL VERTICAL CRACKING ON EXTERIOR FACE OF

CLOSURE DIAPHRAGMS AT PIERS, WEST SIDE AT PIER #1 SHOWN

PHOTO #13 - STEEL PLATE MISSING ON SOUTH SIDE OF PIER #4, EAST

SIDE OF GIRDER #1

PHOTO #14 - TYPICAL DELAMINATION OF CLOSURE DIAPHRAGMS AT

PIERS, DIAPHRAGM BETWEEN GIRDERS #1 AND #2 IN SPAN #3 AT PIER

#2 SHOWN

PHOTO #15 - GENERAL VIEW OF SOUTH ABUTMENT

PHOTO #16 - DELAMINATION AND SPALLING OF FINISH COAT ON

SOUTHWEST WINGWALL NEAR ABUTMENT

PHOTO #17 - GENERAL VIEW OF PIER #2, NORTH SIDE; NOTE TYPICAL

EROSION OF SLOPE AROUND PIERS

PHOTO #18 - TYPICAL EROSION AND UNDERMINING OF CHANNEL

BANKS BELOW STRUCTURE IN SPAN #2, SOUTH CHANNEL BANK

PHOTO #19 - LOOKING UPSTREAM THROUGH STRUCTURE, SPAN #2;

NOTE TYPICAL EROSION OF CHANNEL BANKS AND VEGETATION

PHOTO #20 - LOOKING DOWNSTREAM THROUGH STRUCTURE, SPAN

#2; NOTE TYPICAL EROSION OF CHANNEL BANKS AND VEGETATION