Bridge_Inspection_Report_2021_Structure_8140-008S_0002.pdf

BRIDGE INSPECTION REPORT

POINT BONITA VIADUCT

POINT BONITA TRAIL OVER RAVINE

GOLDEN GATE NATIONAL RECREATION AREA

LE

STRUCTURE NO. 8140-008S

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 8/30/2021

SD

Report prepared by:

Federal Highway Administration Federal Lands Bridge Office Bridge Inspection and Management Program 21400 Ridgetop Circle Sterling, Virginia 20166 https://bridge.flhd.fhwa.dot.gov https://bridge.flhd.fhwa.dot.gov

STRUCTURE SUMMARY STRUCTURE NO. 8140-008S

POINT BONITA VIADUCT INSPECTION DATE: 08/30/2021

BRIDGE IDENTIFICATION AND DESCRIPTION

MAIN SPAN MATERIAL:

MAIN SPAN TYPE:

# OF BEAMS, MAIN SPAN: .

DECK TYPE:

WEARING SURFACE:

ABUT. FOUNDATIONS:

PIER FOUDNATION(S):

ABUTMENT / PIER MAT'L: ..

PROJ./PLAN REF. NO:

NPS ROAD CLASS:

STRUCTURE HISTORY:

2 - CONCRETE CONTINUOUS

01 - SLAB

1 - CONCRETE CAST-IN-PLACE

0 - NONE

1 - SILL

1 - CONCRETE

UNKNOWN

6 - RESTRICTED

2004-RAILING PAINTED.

2015-APPROACHES REPAVED

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:

39.0 FT (11.9 M)

19.5 FT (5.9 M)

12.7 FT (3.9 M)

12.0 FT (3.7 M)

0 °

N

LOCATION

GOLDEN GATE NATIONAL RECREATION AREA MILE POINT: .. .00 (KM PT 0)

STATE: .............................. 069 - CALIFORNIA LOCATION: .... Point Bonita Trail. FP key required for gate at trailhead.FACILITY CARRIED: ......... POINT BONITA TRAIL

FEATURE INTERSECTED: RAVINE

INSPECTION TEAM: B. Kamrath, S. Marks

CONDITION ASSESSMENT:

Beau Kamrath

REPORT REVIEW:

Marcus Miller

REPORT APPROVAL: Date: 11/02/2021

Jorgomai Ceesay

STRUCTURE EVALUATION SUMMARY

This concrete slab bridge is in satisfactory condition. The main problems are site-related, and include a local slope failure that has undermined the slope under the bridge and south side of the west approach roadway. Erosion under the bridge has exposed one column under the slab at midspan. The condition of the slopes and column will continue to be monitored until repairs can be made.

Other problems include severely corroded and failed drainage pipes carrying runoff down the slope and deteriorated paint on the railing.

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

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 8140-008S

POINT BONITA VIADUCT INSPECTION DATE : 08/30/2021

PRIORITY OF IMPROVEMENT226

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

B (Major) - Structure is seriously deficient or presents a safety hazzard, but can remain open 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. Preventive maintenance may be required.

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

C

Item No.

Maintenance Recomendations

(GENERALLY NOT FLHP ELIGIBLE)

QTY. UNIT UNIT

COST

PRELIM.

COST

ESTIMATE

58.6

TRIM SHRUBS BACK AND REPAINT RAILING ALONG

SOUTH EDGE. 1 LS 1000 1000

PRELIM. MAINTENANCE TOTAL : 1000

Item No.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS)

QTY. UNIT

UNIT

COST

PRELIM. COST ESTIMATES

REHAB RECONSTR

60.17, 223.4

FILL AND STABILIZE SLOPE AT APPROACHES

AND UNDER BRIDGE. 1 LS 100000 100000

58.7 REPLACE DRAINAGE SYSTEM UNDER BRIDGE

AND APPROACH. 1 LS 50000 50000

CONTRACT COSTS FOR MOBILIZATION,

TRAFFIC CONTROL, DESIGN, AND

CONSTRUCTION ENGINEERING.

1 LS 200000 200000

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL : 350000

COST ESTIMATE SUMMARY

PRELIM. MAINTENANCE TOTAL :

PRELIM. REHABILITATION TOTAL :

PRELIM. RECONSTRUCTION TOTAL : .. 0

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 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. 8140-008S

POINT BONITA VIADUCT INSPECTION DATE: 08/29/2021

58. DECK

1. DECK SLAB

4. RIDEABILITY

5. CURBS, SIDEWALKS, AND MEDIAN

6. PARAPETS AND/OR RAILINGS

7. DRAINS AND DRAINAGE

8. UTILITIES

9. DEFLECTION AND/OR VIBRATION

10.OTHER:

59. SUPERSTRUCTURE

1. BEARING DEVICES

2. GIRDERS OR BEAMS

3. ARCH(ES) OR SLAB(S)

4. FLOOR BEAMS AND STRINGERS

5. TRUSSES

6. DIAPHRAGMS AND BRACING

7. PAINT

8. FASCIA(E)

9. DEFLECTION AND/OR VIBRATION

10.ALIGNMENT

11.OTHER

60. SUBSTRUCTURE

61. CHANNEL

1. ALIGNMENT

2. EROSION AND/OR SCOUR

3. CHANNEL PROTECTION

4. WATERWAY OBSTRUCTIONS

5. OTHER

6. ADEQUACY OF OPENING

7. NORMAL VELOCITY

8. AVERAGE CLEAR OPENING

9. STREAMBED COMPOSITION:

222. APPROACHES

1. APPROACH SLABS

2. RELIEF JOINTS

3. APPROACH GUARDRAIL

4. SURFACING

5. EROSION

6. SETTLEMENT

7. SIGNS

8. ALIGNMENT

9. OTHER

223. RETAINING WALL

1. WALL

2. WEEP HOLES

3. FOUNDATION

4. EROSION AND/OR SCOUR

5. SETTLEMENT OR DEFLECTION

6. OTHER

G

G

G

F

P

G

N

N

N

G

N

N

N

N

N

G

G

N

N

N

N

F

G

F

N

F

P

N

2. EXPANSION JOINTS N

3. WEARING SURFACE N

N FT

DRAINAGE

G

CONDITION RATING CODE EQUIVALENTS FOR SUB-ELEMENTS

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

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

NOT APPLICABLEN

EXCELLENT CONDITION9

VERY GOOD CONDITION - no problems noted.8

GOOD CONDITION - some minor problems.7

SATISFACTORY CONDITION - structural elements show some minor deterioration.6

FA R 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.4

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.

“ MM NENT” FA LURE CONDITION - major deterioration or section loss present in critical structural components or obvious vertical or horizontal movement affecting structure stability.

Structure is closed to

FA LED CONDITION - out of service; beyond corrective action. 0

ABUTMENTS

1. BREASTWALLS OR COLUMNS N

2. PILE BENTS N

3. CAPS AND/OR BEARING SEATS N

4. BACKWALLS AND/OR BULKHEADS N

5. FOUNDATIONS N

6. WINGWALLS N

7. WEEP HOLES N

8. EXPANSION JOINTS N

9. EROSION AND/OR SCOUR G

10.SETTLEMENT OR DEFLECTION G

11.SLOPE PROTECTION N

12.OTHER N

36. TRAFFIC AND SAFETY FEATURES

A. BRIDGE RAILINGS:

B. TRANSITIONS:

C. APPROACH GUARDRAILS:

D. APPROACH GUARDRAIL ENDS:

N

N

N

N

PIER(S) TRAFFIC SAFETY RATING CODES

13. WALLS AND/OR COLUMNS N

N

G

F

F

G

N

0 - Does not meet standards or a safety features is 14.PILE BENTS required and none is provided.

15.CAPS AND/OR BEARING SEATS

1 - Meets currently acceptable standards.

16.FOUNDATIONS 11 - PILES-BURIED

17.EROSION AND/OR SCOUR N - Not applicable or a safety features is not required.

18.SETTLEMENT OR DEFLECTION

19.OTHER

FIELD INSPECTION REPORT STRUCTURE NO. 8140-008S

ITEM REFERENCE AND REMARKS

58.1

59.3

CAST-IN-PLACE CONCRETE SLAB SPANS OLD SLOPE FAILURE. SLAB APPEARS TO BE IN GOOD CONDITION; MINOR VERTICAL CRACKING ON SOUTH FACE NEAR MIDSPAN. MINOR LONGITUDINAL CRACKING AT ISOLATED LOCATIONS.

58.5 MINOR SHRINKAGE CRACKS IN CURB.

58.6 RAILING WAS REPAINTED IN 2004; MINOR (PREVIOUSLY NOTED AS MODERATE) PAINT DETERIORATION ON POSTS AND RUB RAIL. HEAVY PAINT DETERIORATION ON TOP RAIL AT EAST END. MODERATE CHECKING (1/8"W) THROUGHOUT RAILING TIMBER.

LARGE SHRUB GROWS AGAINST EAST END OF RAILING.

58.7

222.9

CATCH DRAIN IN WEST APPROACH; SEVERE RUSTING OF DRAINAGE PIPE AT DOWNHILL SIDE. SEVERE RUSTING OF ADDITIONAL STEEL DRAINAGE PIPE PROTRUDING FROM UNDER STRUCTURE AT DOWNHILL SIDE. DEBRIS AND SAND BUILD-UP ALONG

SOUTH EDGE OF DECK.

60.16 MINOR (PREVIOUSLY NOTED AS SEVERE) HONEYCOMBING (1/2"D) OF CONCRETE COLUMN AT MID-HEIGHT. COLUMN DOES NOT

APPEAR TO PROVIDE SIGNIFICANT STRUCTURAL SUPPORT.

60.17 MODERATE SLOPE EROSION, 10'L X 32"W X 3.5'H (PREVIOUSLY 3'H), HAS EXPOSED ONE CONCRETE COLUMN UNDER CAP AT

MIDSPAN.

222.3 PREVIOUSLY NOTED MODERATE DECAY (3"D) OF FIRST RAIL POST FROM STRUCTURE AT WEST APPROACH NOT OBSERVED AT

TIME OF INSPECTION.

222.5 SEVERE EROSION ALONG THE SOUTH SIDE OF WEST APPROACH AND STRUCTURE. SLOPE FAILURE IS WITHIN 1' OF WEST APPROACH PAVEMENT. THREE BARRICADES PREVIOUSLY PLACED ALONG WALKWAY HAVE FALLEN ONTO SLOPE.

222.8 CURVE AT EAST APPROACH.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 8140-008S

STRUCTURE IDENTIFICATION

(201) PARK: GOLDEN GATE NATIONAL RECREATION AREA

(202) STRUCTURE NAME:..............POINT BONITA VIADUCT

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

(204) STRUCTURE NUMBER:.........8140-008 S

6 - PACIFIC WEST(205) NPS REGION:

(206) ROUTE CODE NUMBER:

(207) ROAD SECTION NO:

(208) NPS ROAD CLASS:............... 6 - RESTRICTED

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

(210) OPERATING UNIT:.................PARK

(211) PROJECT NO(S):................... UNKNOWN

(212) DRAWING NUMBERS:...........NONE

(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) HISTORIC DESIGNATION:

069 - CALIFORNIA

01041 CRENSHAW

00000

1 6 0 00000 0

RAVINE

POINT BONITA TRAIL

8140008S0000000

Point Bonita Trail. FP key required for gate at trailhead.

6 00 FT ( 1 83 M)

.00 (KM PT: 0 )

3 - ON FREE ROAD

5 - NOT ELIGIBLE

STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE

(43A) MAIN STR. MATERIAL:..........2 - CONCRETE CONTINUOUS (44A) APPR. STR. MATERIAL:............ 0 - Other

(43B) MAIN STR. TYPE:.................. 01 - SLAB (44B) APPR. STR. TYPE:.................... 00 - OTHER

(45) NO. OF MAIN SPANS:..............002 (46) NO OF APPROACH SPANS:

(48) MAX. SPAN LENGTH:..............19.5 FT ( 5.9 M)

(49) STRUCTURE LENGTH:........... 39.0 FT ( 11.9 M) (108) WEAR SURFACE/PROTECT SYSTEM:

(216A) ABUTMENT #1 FDN:........... A) TYPE WEARING SURFACE:.. 0 - NONE

(216B) ABUTMENT #2 FDN:........... 0 - UNKNOWN B) TYPE MEMBRANE:................. 0 - NONE

(217A) PREDOM. PIER FDN:.......... 1 - SILL C) TYPE PROTECTION:.............. 0 - NONE

(217B) SECOND. PIER FDN:.......... 6 - N/A (218) IS SALT USED?.......................... NO

(107) DECK TYPE:.......................... 1 - CONCRETE CAST-IN-PLACE

LOAD RATING AND POSTING

(31) DESIGN LOAD:.........................0 - UNKNOWN (41) LOAD RESTRICTION:.................. R - POSTED FOR OTHER LOAD-

CAPACITY RESTRICTION

(66) INVENTORY RATING:.............. TONS ( 0 METRIC TONS) (70) BRIDGE POSTING:...................... 5 - EQUAL TO OR ABOVE LEGAL

LOADS

(64) OPERATING RATING:.............. TONS ( 0 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 08/30/3021 (91) FREQ. OF INSP: 24 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):

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

(220) SPECIAL STUDY TYPE: 0 - NONE INSP. EVERY MONTHS - LAST INSP:

(221) SPECIAL STUDY DATE: (B) UNDERWATER:..................... N

INSP. EVERY MONTHS - LAST INSP:

(C) SPECIAL INSPECTION:........ N

INSP. EVERY MONTHS - LAST INSP:

https://LENGTH:

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 8140-008S

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE:................................ 37° 49'13 00" (51) CURB TO CURB WIDTH:............ 12.0 FT ( 3.7 M)

(17) LONGITUDE:............................122°31 '48 20" (52) DECK WIDTH:.......................... 12.7 FT ( 3.9 M)

(19) DETOUR LENGTH:.................. 199 MI ( 199 KM) (32) APPR. ROADWAY WIDTH:...... 12.0 FT ( 3.7 M)

(28A) LANES ON STRUCT:.............01 (213) APPR. PAVEMENT WIDTH:... 12.0 FT ( 3.7 M)

(28B) LANES UNDER STRUCT:......00 LEFT SHOULDER:............... 0 0 FT ( 0 M)

(42A) SERVICE ON:.........................3 - PEDESTRIAN-BICYCLE RIGHT SHOULDER:.......... 0 0 FT ( 0 M)

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

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

(30) YEAR OF ADT:......................... 2008 (35) STRUCTURE FLARED:............ 0 - NO FLARE

(114) FUTURE ADT:.........................0 (47) TOTAL HORIZ. CLEARANCE:.. 12 FT ( 3.7 M)

(115) YEAR OF FUTURE ADT:........2028 (50) SIDEWALKS

(101) PARALLEL STRUCTURE:......N - NO PARALLEL STRUCTURE LEFT:.................................... 0 0 FT ( 0 M)

(38) NAVIGATION CONTROL:.........0 - NO NAVIGATION CONTROL ON RIGHT:.................................. 0 0 FT ( 0 M)

WATERWAY (BRIDGE PERMIT NOT

REQUIRED)

(39) VERTICAL CLEARANCE:.........0 FT ( 0 M) (214) BRIDGE RAIL TYPE

1 - FULL HEIGHT (NO PARAPET)(40) HORIZ. CLEARANCE:..............0 FT ( 0 M) RAIL CONFIGURATION:

(111) ABUT OR PIER PROT:........... MATERIAL:........................... 7 - T MBER

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

(55) RIGHT:...............................00 FT ( 0 M) (215) BRIDGE RAIL HEIGHT:.......... 3.67 FT ( 1.12 M)

(56) LEFT:................................ 0 FT ( 0 M) (53) MIN. VRT. CLR. OVER DECK: 99.99 FT ( 99.99 M)

(54) MIN. VRT. UNDRCLRANCE:... .00 FT ( 0 M)

CONDITION AND APPRAISAL DATA, PROPOSED IMPROVEMENTS, AND COST

(58) DECK:....................................... 7 (67) STRUCTURAL EVALUATION:

(59) SUPERSTRUCTURE:...............7 (68) DECK GEOMETRY:

(60) SUBSTRUCTURE:.......... 6 (69) UNDERCLEARANCES:................ N

(61) CHANNEL:................................N (71) WATERWAY ADEQUACY:........... N

(62) CULVERT:.................................N (72) APPROACH ALIGNMENT:

(222) APPROACHES:...................... 5 (113) SCOUR CRITICAL:.................... N - NOT OVER WATERWAY

(223) RETAINING WALL:.................N (225) PROPOSE OF IMPROVEMENT: 2 - REHAB/RECONSTRUCTION

(36) TRAFFIC SAFETY FEAT: N N N N (226) PRIORITY OF IMPROVEMENT: C - MODERATE

(75A) TYPE OF WORK:................... (227) MAINTENANCE COST:.............$ 1000

(75B) WORK DONE BY:.................. (228) REHAB / RECNSTR COST:..... $ 350000

(76) IMPROVEMENT LENGTH:....... FT ( 0 M) (229) CONSTRUCTION COST:.......... $ 0

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

2004-RAILING PAINTED.

2015-APPROACHES REPAVED

(231) ADDITIONAL CONSIDERATIONS:

FP KEY REQUIRED FOR GATE AT TRAILHEAD.

(330) ADDITIONAL CONFIGURATION INFORMATION:

Inspector: Beau Kamrath Structure Number: 8140008S0000000

Inpsection Date: 08/30/2021 Facility Carried: POINT BONITA TRAIL

Bridge Inspection Report

Pictures

PHOTO 3

Description LOOKING WEST TOWARD LIGHTHOUSE

PHOTO 4

Description SOUTH (DOWNHILL) SIDE

Bridge Inspection Report

Pictures

PHOTO 5

Description GENERAL TOPSIDE VIEW LOOKING EAST

PHOTO 6

Description GENERAL UNDERSIDE VIEW LOOKING EAST

Bridge Inspection Report

Pictures

PHOTO 7

Description TYPICAL LONGITUDINAL CRACKING OF DECK

PHOTO 8

Description ACCUMULATION OF DIRT AND DEBRIS ALONG SOUTH CURB

Bridge Inspection Report

Pictures

PHOTO 9

Description TYPICAL CONDITION OF TIMBER RAIL

PHOTO 10

Description EAST END OF SOUTH RAIL; NOTE PAINT LOSS AND TREE GROWTH

Bridge Inspection Report

Pictures

PHOTO 11

Description TOP OF SOUTH TIMBER RAIL; NOTE LOSS OF PAINT AND CHECKING OF TIMBER

PHOTO 12

Description UNDERSIDE OF TRANSVERSE BEAM; NOTE EXPOSED DRILLED SHAFT

Bridge Inspection Report

Pictures

PHOTO 13

Description EXPOSED DRILLED SHAFT BENEATH TRANSVERSE BEAM

PHOTO 14

Description WEST APPROACH

Bridge Inspection Report

Pictures

PHOTO 15

Description EAST APPROACH

PHOTO 16

Description VIEW FROM BRIDGE LOOKING UPHILL

Bridge Inspection Report

Pictures

PHOTO 17

Description VIEW FROM BRIDGE LOOKING DOWNHILL

PHOTO 18

Description FAILED DRAINAGE PIPE NEAR WEST ABUTMENT ON DOWNHILL SIDE; NOTE BARRICADE

FALLEN ONTO SLOPE

Bridge Inspection Report

Pictures

PHOTO 19

Description DRAIN PIPE CLOGGED UP TO 80% NEAR SOUTH SIDE OF EAST SPAN

PHOTO 20

Description FAILED STEEL DRAINAGE PIPE APPROXIMATELY 15' FROM BRIDGE ON DOWNHILL SIDE