Attachment 8 - Structure Inspection Report.pdf
PDF 10 MB Posted
- Attached to
- Mid-Atlantic Region Construction Multiple Award Task Order Contract (MATOC) Federal contract opportunity
- Solicitation number
- 693C73-25-R-000073
About this file
This document is a series of tunnel inspection reports for four different tunnels located in the C&O Canal National Historical Park in Maryland, prepared by the Federal Highway Administration's Bridge Inspection Program. The reports cover Four Locks Tunnel, McCoys Ferry Tunnel, Carderock Tunnel, and another tunnel, all inspected in November 2023. Each report includes detailed structural assessments, condition ratings, photographic documentation, and recommended maintenance and rehabilitation actions.
The inspection reports provide comprehensive evaluations of each tunnel's condition, identifying issues such as masonry deterioration, water leakage, concrete spalling, exposed rebar, cracking, vegetation growth, drainage problems, and safety signage deficiencies. Recommendations range from minor maintenance like clearing debris and repairing mortar joints to more significant rehabilitation efforts including repaving approaches, sealing cracks, and replacing damaged concrete sections. The tunnels, most built in the 1830s, are located on historic canal access roads and vary in length from approximately 108 to 124 feet, with concrete or masonry linings and priority improvement ratings ranging from minor to moderate.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Amendment 0002 - Mid-Atlantic Region Construction MATOC - 693C73-25-R-000073.pdf | ||
| Amendment 0001 - Mid-Atlantic Region Construction MATOC - 693C73-25-R-000073.pdf | ||
| Attachment 5 - Plans Sheets for Seed Project.pdf | ||
| Attachment 6 - Permit SHA-3-MO-1001-24-DO.pdf | ||
| Mid-Atlantic IDIQ RFP 693C73-25-R-000073.pdf | ||
| Attachment 1 - Technical Information Form.doc | DOC document | |
| Attachment 4 - J-Pages - SCRs for Seed Project.pdf | ||
| Attachment 13 - Bid Bond for Seed Project.pdf | ||
| Attachment 7 - NEPA CE MD NP CHOH 235(2) 242(1).pdf | ||
| Attachment 9 - Utility Status Report.pdf | ||
| Attachment 10 - Pavement Memo.pdf | ||
| Attachment 11 - Hydraulics Memo.pdf | ||
| Attachment 12 - MINIMUM WAGE DETERMINATION.pdf | ||
| Attachment 2 - VETS-4212 Form.pdf | ||
| Attachment 3 - B Pages - MD NP CHOH 235(2)_242(1)_ETC.pdf |
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Text version
TUNNEL INSPECTION REPORT
FOUR LOCKS TUNNEL
FOUR LOCKS ROAD THROUGH C&O CANAL
C&O CANAL NATIONAL HISTORICAL PARK
SOUTH PORTAL
STRUCTURE NO. 3100-020P
INSPECTION TYPE: ROUTINE
INSPECTION DATE: 11/16/2023
NORTH PORTAL
Report prepared by:
Federal Highway Administration FLH Office of Bridges and Structures Bridge Inspection Program 22001 Loudoun County Parkway, Building E2, Suite 200 Ashburn, VA 20147 https://bridge.flhd.fhwa.dot.gov
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-020P
FOUR LOCKS TUNNEL INSPECTION DATE : 11/16/2023
226 PRIORITY OF IMPROVEMENT C
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 hazard, 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.
Item No.
Maintenance Recommendations
(GENERALLY NOT FLHP ELIGIBLE)
QTY. UNIT UNIT
COST
PRELIM.
COST
ESTIMATE
222.7
REPOST MINIMUM VERITCAL CLEARANCE WITH A LOW
CLEARANCE ADVANCE (W12-2) SIGN WITH DIMENSION OF
8’-0” AT THE NEAREST INTERSECTING ROAD (OR WIDE
POINT IN THE ROAD AT WHICH A VEHICLE CAN DETOUR
OR TURN AROUND) ON THE NORTH SIDE OF TUNNEL.
INSTALL LOW CLEARANCE OVERHEAD (W12-2A OR W12-
2B) SIGNS ON BOTH PORTALS AT 1FT 6IN FROM EAST AND
WEST WALLS WITH DIMENSION 8’-0”. SEE SAMPLES ON
PAGE 23.
INSTALL REFLECTIVE OBJECT MARKERS AT CORNERS.
1 LS
FILL PONDING AREA INSIDE NORTH PORTAL.
1 LS
PRELIM. MAINTENANCE TOTAL :
Item REHABILITATION/RECONSTRUCTION
UNIT
UNIT PRELIM. COST ESTIMATES
No. (TYPICALLY NEEDED WITHIN 5 YEARS)
QTY. COST
REHAB RECONSTR
59T.5, 222.4
REPAVE TUNNEL ASPHALT OVERLAY AND
APPROACHES. 1 LS
59T.4 INSTALL SYSTEM TO DRAIN APPROACH AND
TUNNEL PAVEMENT. 1 LS
59T.1 CLEAN AND REPOINT MASONRY MORTAR
JOINTS THROUGHOUT TUNNEL AS NEEDED. 1 LS
59T.3 REMOVE UNSOUND CONCRETE FROM CURB,
CLEAN REBAR, AND PLACE NEW CONCRETE
TO ORIGINAL DIMENSIONS.
1 LS
59T.1, 59T.2
REPAIR OR REPLACE FRACTURED AND
MISSING STONES FROM PORTALS AND LINING. 1 LS
222.7
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-020P
INSPECTION DATE : 11/16/2023FOUR LOCKS TUNNEL
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 hazard, 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
CONTRACT COSTS FOR MOBILIZATION,
TRAFFIC CONTROL, AND CONTINGENCIES. 1 LS
PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :
COST ESTIMATE SUMMARY
PRELIMINARY ESTIMATE TOTAL * : .......................... PRELIM. MAINTENANCE TOTAL :
PRELIM. REHABILITATION TOTAL : ...... (*Includes typical contract costs for mobilization, traffic control and design/construction engineering: but does not include detour bridges, PRELIM. RECONSTRUCTION TOTAL : . 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.)TOTAL ITEMIZED COSTS:
Remarks : Cost estimates assume that recommended actions will be combined with similar work being performed on other structures.
STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 3100-020P
FOUR LOCKS TUNNEL INSPECTION DATE: 11/16/2023
STRUCTURE IDENTIFICATION
(1) STATE:............................................ 243 - MARYLAND
(2) STATE HWY. AGENCY DIST:
(201) PARK: C&O CANAL NATIONAL HISTORICAL PARK
(202) STRUCTURE NAME:..............FOUR LOCKS TUNNEL
(203) STRUCTURE KIND:............... 3 - TUNNEL
(204) STRUCTURE NUMBER:.........3100-020 P
2 - NATIONAL CAPITAL(205) NPS REGION:
(206) ROUTE CODE NUMBER:
(207) ROAD SECTION NO:
(208) NPS ROAD CLASS:............... 2 - CONNECTOR ROAD
(209) WITHIN NPS BNDRY?:.......... Yes
(210) OPERATING UNIT:.................PARK
(211) PROJECT NO(S):
(212) DRAWING NUMBERS:...........NONE
(21) MAINTAINED BY:......................66 - NATIONAL PARK SERVICE
(22) OWNER:................................... 66 - NATIONAL PARK SERVICE
(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:
24001 ALLEGANY
00000
2 6 4 00415 0
C&O CANAL
FOUR LOCKS ROAD
3100020P0000000
0.7 miles from MD Route 56 on Four Locks Road.
7.79 FT ( 2.37 M)
108.5 (KM PT: 174.5)
0 8
3 - ON FREE ROAD
2 - ELIGIBLE FOR NATIONAL
REGISTER
STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE
(43A) MAIN STR. MATERIAL:..........8 - MASONRY (44A) APPR. STR. MATERIAL:............ 0 - Other
(43B) MAIN STR. TYPE:.................. 18 - TUNNEL (44B) APPR. STR. TYPE:.................... 00 - OTHER
(45) NO. OF MAIN SPANS:..............001 (46) NO OF APPROACH SPANS:
(48) MAX. SPAN LENGTH:..............12 FT ( 3.7 M)
(49) STRUCTURE LENGTH:........... 108. FT ( 32.9 M) (108) WEAR SURFACE/PROTECT SYSTEM:
(216A) ABUTMENT #1 FDN:........... 6 - N/A A) TYPE WEARING SURFACE:.. 4 - LOW SLUMP CONCRETE
(216B) ABUTMENT #2 FDN:........... 6 - N/A B) TYPE MEMBRANE:................. 0 - NONE
(217A) PREDOM. PIER FDN:.......... 6 - N/A C) TYPE PROTECTION:.............. 0 - NONE
(217B) SECOND. PIER FDN:.......... 6 - N/A (218) IS SALT USED?.......................... NO
(107) DECK TYPE:.......................... N - NOT APPLICABLE
LOAD RATING AND POSTING
(31) DESIGN LOAD:.........................0 - UNKNOWN (41) LOAD RESTRICTION:.................. A - OPEN
(66) INVENTORY RATING:..............0 METRIC TONS) (70) BRIDGE POSTING:...................... 5 - EQUAL TO OR ABOVE LEGALTONS ( 0
LOADS
(64) OPERATING RATING:..............0 TONS ( 0 METRIC TONS)
INSPECTION DATES
(90) INSPECTION DATE: 11/16/2023 (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:
Four Locks Tunnel Structure No. 3100-020P Inspection Date 11/16/2023
By: MM, WM
Element/ Str. Unit
Element/Structure Unit Description
Total Qty
Units Condition State Quantity
CS 1 CS 2 CS 3 CS 4
10005 Masonry Tunnel Liner 5435 SF 0 5435 0 0
Leakage 2000 Efflorescence 2000
Mortar Breakdown 1415 Split / Spall 20
Masonry Displacement
10055 Masonry Portal 988 SF 889 95 4 0 Efflorescence 20
Mortar Breakdown 20 Split / Spall 55
Masonry Displacement 4
10111 Concrete, Slab on Grade 1134 SF 0 280 280 574 Cracking 280 280 574
Settlement
10161 Concrete Traffic Barrier 108 LF 0 0 0 108 Delamination/Spall/Patched Area 108
10300 Drainage 1 EA 0 1
10850 Traffic Signs 1 EA 1
Inspector: Marcus Miller Structure Number: 3100020P0000000
Inspection Date: 11/16/2023 Facility Carried: FOUR LOCKS ROAD
Tunnel Inspection Report
Pictures
PHOTO 3
Description GENERAL VIEW LOOKING NORTH THROUGH TUNNEL
PHOTO 4
Description EFFLORESCENCE FROM MORTAR JOINTS AT NORTH PORTAL
Tunnel Inspection Report
Pictures
PHOTO 5
Description FRACTURED STONE ON EAST SIDE OF NORTH PORTAL; NOTE VEGETATION GROWTH
FROM MORTAL JOINTS
PHOTO 6
Description NORTHWEST WINGWALL
Tunnel Inspection Report
Pictures
PHOTO 7
Description NORTHEAST WINGWALL
PHOTO 8
Description GENERAL UNDERSIDE VIEW ALONG TUNNEL CROWN LOOKING NORTH
Tunnel Inspection Report
Pictures
PHOTO 9
Description GENERAL VIEW OF WEST LINING LOOKING SOUTH
PHOTO 10
Description TYPICAL VOIDS (UP TO 16") IN NUMEROUS LOCATIONS THROUGHOUT TUNNEL LINING, WEST LINING 15' FROM SOUTH PORTAL SHOWN
Tunnel Inspection Report
Pictures
PHOTO 11
Description WEST LINING NEAR SOUTH END; NOTE DETERIORATION OF MORTAR JOINTS AND ACTIVE
LEAKAGE
PHOTO 12
Description TYPICAL VOIDS (UP TO 16") IN NUMEROUS LOCATIONS THROUGHOUT TUNNEL LINING, WEST CROWN AREA NEAR SOUTH PORTAL SHOWN
Tunnel Inspection Report
Pictures
PHOTO 13
Description TYPICAL DETERIORATION OF MORTAR JOINTS, FRACTURED ROCK, AND VOIDS IN
TUNNEL LINING, CROWN REGION, 70' FROM SOUTH PORTAL SHOWN
PHOTO 14
Description EAST WALL AT NORTH PORTAL; NOTE MISSING STONE AND DETERIORATED MORTAR
JOINTS
Tunnel Inspection Report
Pictures
PHOTO 15
Description MISSING STONE AND DETERIORATION OF MORTAR JOINTS IN EAST LINING NEAR NORTH
PORTAL; NOTE EVIDENCE OF WATER INTRUSION
PHOTO 16
Description TYPICAL CRACKING, SPALLING AND SCALING OF TUNNEL SLAB, NEAR SOUTH PORTAL
SHOWN
Tunnel Inspection Report
Pictures
PHOTO 17
Description TYPICAL CRACKING, SPALLING, AND SCALING OF APPROACH AND TUNNEL SLAB, NORTH
END SHOWN
PHOTO 18
Description TYPICAL DETERIORATION OF WEST CURB, SOUTH END SHOWN
Tunnel Inspection Report
Pictures
PHOTO 19
Description DRAINAGE PIPE AT SOUTHEAST SIDE OF TUNNEL
PHOTO 20
Description MASONRY RETAINING WALL EXTENDING ALONG NORTHWEST SIDE; NOTE VEGETATION
GROWTH AND VOIDS ALONG MASONRY STONES
Tunnel Inspection Report
Pictures
PHOTO 21
Description SOUTH APPROACH; NOTE DETERIORATED APPROACH SLAB
PHOTO 22
Description NORTH APPROACH; NOTE DETERIORATED APPROACH SLAB
Tunnel Inspection Report
Pictures
PHOTO 23
Description VERTICAL CLEARANCE SIGN AT NORTH APPROACH
PHOTO 24
Description "FLOOD AREA" WARNING SIGN AT NORTH APPROACH
MCCOYS FERRY TUNNEL
C&O CANAL THROUGH MCCOYS FERRY ACCESS ROAD
C&O CANAL NATIONAL HISTORICAL PARK
NORTH PORTAL
STRUCTURE NO. 3100-021P
INSPECTION TYPE: ROUTINE
INSPECTION DATE: 11/16/2023
SOUTH PORTAL
Report prepared by:
Federal Highway Administration FLH Office of Bridges and Structures Bridge Inspection Program 22001 Loudoun County Parkway, Building E2, Suite 200
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-021P
McCOYS FERRY TUNNEL INSPECTION DATE : 11/16/2023
226 PRIORITY OF IMPROVEMENT C
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 hazard, 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.
Item No.
Maintenance Recommendations
(GENERALLY NOT FLHP ELIGIBLE)
QTY. UNIT UNIT
COST
PRELIM.
COST
ESTIMATE
59T.2, 223.1, 223.5
REMOVE TREE AND VEGETATION GROWTH FROM
RETAINING WALL AND WINGWALLS AS NECESSARY.
RESET DISPLACED STONES.
1 LS
222.7
REPOST MINIMUM VERITCAL CLEARANCE WITH A LOW
CLEARANCE ADVANCE (W12-2) SIGN WITH DIMENSION OF
8’-0” AT THE NEAREST INTERSECTING ROAD (OR WIDE
POINT IN THE ROAD AT WHICH A VEHICLE CAN DETOUR
OR TURN AROUND) ON THE NORTH SIDE OF TUNNEL.
INSTALL LOW CLEARANCE OVERHEAD (W12-2A OR W12-
2B) SIGNS ON BOTH PORTALS AT 1FT FROM EAST AND
WEST WALLS WITH DIMENSION 8’-0”. SEE SAMPLES ON
PAGE 20.
INSTALL REFLECTIVE OBJECT MARKERS AT CORNERS.
1 LS
59T.5
REMOVE DEBRIS FROM FLOOR ALONG TUNNEL WALLS.
1 LS
PRELIM. MAINTENANCE TOTAL :
Item REHABILITATION/RECONSTRUCTION
UNIT
UNIT PRELIM. COST ESTIMATES
No. (TYPICALLY NEEDED WITHIN 5 YEARS)
QTY. COST
REHAB RECONSTR
59T.1 FILL VOIDS AND REPOINT MASONRY MORTAR
JOINTS THROUGHOUT TUNNEL LINING AS
NECESSARY.
1 LS
222.4 REPAVE/REGRADE APPROACHES.
1 LS
59T.1 PATCH SPALLING AT END OF SOUTHEAST
WINGWALL AND AT BASE OF CONCRETE
LINING, EAST WALL NEAR SOUTH PORTAL.
1 LS
CONTRACT COSTS FOR MOBILIZATION,
TRAFFIC CONTROL, AND CONTINGENCIES. 1 LS
PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-021P
McCOYS FERRY TUNNEL INSPECTION DATE : 11/16/2023
226 PRIORITY OF IMPROVEMENT C
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 hazard, 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.
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 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
STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 3100-021P
McCOYS FERRY TUNNEL INSPECTION DATE: 11/16/2023
STRUCTURE IDENTIFICATION
(201) PARK: C&O CANAL NATIONAL HISTORICAL PARK
(202) STRUCTURE NAME:..............McCOYS FERRY TUNNEL
(203) STRUCTURE KIND:............... 3 - TUNNEL
(204) STRUCTURE NUMBER:.........3100-021 P
2 - NATIONAL CAPITAL(205) NPS REGION:
(206) ROUTE CODE NUMBER:
(207) ROAD SECTION NO:
(208) NPS ROAD CLASS:............... 2 - CONNECTOR ROAD
(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:............................................ 243 - MARYLAND
(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:
24001 ALLEGANY
00000
2 6 4 00208 0
McCOYS FERRY ACCESS ROAD
C&O CANAL
3100021P0000000
1.1 miles from MD Route 56 on McCoys Ferry Road; at campground entrance.
7.80 FT ( 2.38 M)
110.2 (KM PT: 177.3)
0 1
3 - ON FREE ROAD
5 - NOT ELIGIBLE
STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE
(43A) MAIN STR. MATERIAL:..........8 - MASONRY (44A) APPR. STR. MATERIAL:............ 0 - Other
(43B) MAIN STR. TYPE:.................. 18 - TUNNEL (44B) APPR. STR. TYPE:.................... 00 - OTHER
(45) NO. OF MAIN SPANS:..............001 (46) NO OF APPROACH SPANS:
(48) MAX. SPAN LENGTH:..............12 FT ( 3.7 M)
(49) STRUCTURE LENGTH:........... 110. FT ( 33.5 M) (108) WEAR SURFACE/PROTECT SYSTEM:
(216A) ABUTMENT #1 FDN:........... 6 - N/A A) TYPE WEARING SURFACE:.. 4 - LOW SLUMP CONCRETE
(216B) ABUTMENT #2 FDN:........... 6 - N/A B) TYPE MEMBRANE:................. 0 - NONE
(217A) PREDOM. PIER FDN:.......... 6 - N/A C) TYPE PROTECTION:.............. 0 - NONE
(217B) SECOND. PIER FDN:.......... 6 - N/A (218) IS SALT USED?.......................... NO
(107) DECK TYPE:.......................... N - NOT APPLICABLE
LOAD RATING AND POSTING
(31) DESIGN LOAD:.........................0 - UNKNOWN (41) LOAD RESTRICTION:.................. A - OPEN
(66) INVENTORY RATING:..............0 METRIC TONS) (70) BRIDGE POSTING:...................... 5 - EQUAL TO OR ABOVE LEGALTONS ( 0
LOADS
(64) OPERATING RATING:..............0 TONS ( 0 METRIC TONS)
INSPECTION DATES
(90) INSPECTION DATE: 11/16/2023 (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
McCoys Ferry Tunnel Structure No. 3100-021 Inspection Date 11/16/2023
By: MM, WM
Element/ Str. Unit
Element/Structure Unit Description Total Qty
Units Condition State Quantity
CS 1 CS 2 CS 3 CS 4
Span(s) - All
10001 Cast In Place Concrete Tunnel Liner 775 SF 725 50 Delamination/Spall/Patched Area 5
Efflorescence 5 Cracking 40
10005 Masonry Tunnel Liner 2635 SF 0 2635 Leakage 1350
Efflorescence/Rust Staining 1035 Mortar Breakdown 150
Split/Spalls 100 Masonry Displacement
10051 Concrete Portal 386 SF 318 60 Spall 7
Efflorescence 5 Cracking 48
10055 Masonry Portal 1204 SF 1171 33 Efflorescence 5
Mortar Breakdown 10 Split/Spall 18
10111 Concrete Slab on Grade 1320 SF 1295 25 Cracking 25
10300 Drainage 1 EA 1
10850 Traffic Signs 1 EA 1
Inspector: Marcus Miller Structure Number: 3100021P0000000
Inspection Date: 11/16/2023 Facility Carried: C&O CANAL
Tunnel Inspection Report
Pictures
PHOTO 3
Description GENERAL VIEW LOOKING SOUTH ALONG TUNNEL
PHOTO 4
Description VEGETATION GROWTH ON TOP OF NORTH PORTAL
Tunnel Inspection Report
Pictures
PHOTO 5
Description EFFLORESCENCE ALONG CONSTRUCTION JOINT AT NORTH PORTAL
PHOTO 6
Description SPALLING OF SOUTH PORTAL, WEST SIDE
Tunnel Inspection Report
Pictures
PHOTO 7
Description TYPICAL VOIDS, MOSS GROWTH AND VEGETATION GROWTH ON NORTH WINGWALLS, NORTHWEST WINGWALL SHOWN
PHOTO 8
Description CLOSE UP OF TYPICAL VOIDS AT NORTH WINGWALLS; NORWEST WINGWALL SHOWN
Tunnel Inspection Report
Pictures
PHOTO 9
Description GENERAL VIEW OF CONCRETE PORTION OF TUNNEL LINING AT SOUTH END (PHOTO
FROM 2021 INSPECTION)
PHOTO 10
Description SCALING OF CONCRETE PORTION OF TUNNEL LINING AT SOUTH END
Tunnel Inspection Report
Pictures
PHOTO 11
Description HORIZONTAL CRACK ON CONCRETE PORTION OF TUNNEL AT SOUTHEAST END ALONG
CONSTRUCTION JOINT
PHOTO 12
Description GENERAL VIEW OF MASONRY PORTION OF TUNNEL LINING LOOKING SOUTH
Tunnel Inspection Report
Pictures
PHOTO 13
Description TYPICAL CRACKED STONE AND MORTAR JOINTS THROUGHOUT MASONRY TUNNEL
LINING, NORTH END OF TUNNEL SHOWN; NOTE TYPICAL EVIDENCE OF WATER
INTRUSION AND EFFLORESCENCE
PHOTO 14
Description TYPICAL VOIDS (UP TO 2.5') ON MASONRY LINING AT NUMEROUS LOCATIONS ON CROWN
AREA, NORTH END NEAR CROWN SHOWN
Tunnel Inspection Report
Pictures
PHOTO 15
Description TYPICAL VOIDS (UP TO 2.5') ON MASONRY LINING AT NUMEROUS LOCATIONS ON
MASONRY WALL AREA, WEST WALL NEAR MID-LENGTH SHOWN
PHOTO 16
Description TYPICAL DETERIORATION OF MASONRY MORTAR JOINTS AT BOTTOM EAST LINING, 30'
FROM SOUTH PORTAL SHOWN
Tunnel Inspection Report
Pictures
PHOTO 17
Description GENERAL VIEW OF TUNNEL CONCRETE SLAB LOOKING NORTH
PHOTO 18
Description TYPICAL WEAR OF CONCRETE SLAB, NEAR MID-LENGTH SHOWN; NOTE LONGITUDINAL
CRACK IN WEST WHEEL PATH
Tunnel Inspection Report
Pictures
PHOTO 19
Description NORTH APPROACH; NOTE CRACK ON APPROACH SLAB AND POTHOLE IN GRAVEL
PHOTO 20
Description VERTICAL CLEARANCE SIGN AT NORTH APPROACH; NOTE GRAFFITI
CARDEROCK TUNNEL
CARDEROCK PICNIC AREA ACCESS ROAD THROUGH C&O CANAL
C&O CANAL NATIONAL HISTORICAL PARK
SOUTH PORTAL
STRUCTURE NO. 3100-052P
INSPECTION TYPE: ROUTINE
INSPECTION DATE: 11/21/2023
NORTH PORTAL
Report prepared by:
Federal Highway Administration FLH Office of Bridges and Structures Bridge Inspection Program 22001 Loudoun County Parkway, Building E2, Suite 200
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-052P
CARDEROCK TUNNEL INSPECTION DATE : 11/21/2023
226 PRIORITY OF IMPROVEMENT D
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 hazard, 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.
Item No.
Maintenance Recommendations
(GENERALLY NOT FLHP ELIGIBLE)
QTY. UNIT UNIT
COST
PRELIM.
COST
ESTIMATE
222.5, 222.9
REPAIR EROSION AROUND PORTALS AND BEHIND
WINGWALLS. 1 LS
222.7, 222.7
PROPERLY MOUNT AND SECURE UNDERPASS APPROACH
OBJECT MARKERS (REPLACE NORTHWEST AND
SOUTHWEST OBJECT MARKERS). INSTALL VERTICAL
CLEARANCE SIGN AT SOUTH APPROACH.
1 LS
59T.4
REMOVE DEBRIS FROM UNDERPASS APPROACH DRAINS
AND TUNNEL CURBLINES. 1 LS
PRELIM. MAINTENANCE TOTAL :
Item REHABILITATION/RECONSTRUCTION
UNIT
UNIT PRELIM. COST ESTIMATES
No. (TYPICALLY NEEDED WITHIN 5 YEARS)
QTY. COST
REHAB RECONSTR
59T.1, 59T.1
REMOVE DETERIORATED CONCRETE FROM
TOP SLAB UNDERSIDE. CLEAN AND SEAL
EXPOSED REBAR WITH APPROVED
PROTECTIVE COATING.
1 LS
59T.1 CLEAN AND SEAL VERTICAL CRACKING IN
PATCHED AREA. 1 LS
CONTRACT COSTS FOR MOBILIZATION,
TRAFFIC CONTROL, AND CONTINGENCIES. 1 LS
PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 3100-052P
CARDEROCK TUNNEL INSPECTION DATE : 11/21/2023
226 PRIORITY OF IMPROVEMENT D
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 hazard, 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.
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 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
222.7 STRIPED REFLECTIVE OBJECT MARKERS AT UNDERPASS APPROACHES. NORTHWEST AND SOUTHWEST OBJECT MARKERS ARE
ORIENTATED UPSIDE DOWN.
VERTICAL CLEARANCE SIGN, 11' - 6", AT NORTH APPROACH; NO VERTICAL CLEARANCE SIGN AT SOUTH APPROACH.
STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 3100-052P
CARDEROCK TUNNEL INSPECTION DATE: 11/21/2023
STRUCTURE IDENTIFICATION
(201) PARK: C&O CANAL NATIONAL HISTORICAL PARK
(202) STRUCTURE NAME:..............CARDEROCK TUNNEL
(203) STRUCTURE KIND:............... 3 - TUNNEL
(204) STRUCTURE NUMBER:.........3100-052 P
2 - NATIONAL CAPITAL(205) NPS REGION:
(206) ROUTE CODE NUMBER:
(207) ROAD SECTION NO:
(208) NPS ROAD CLASS:............... 3- SPECIAL PURPOSE
(209) WITHIN NPS BNDRY?:.......... Yes
(210) OPERATING UNIT:
(211) PROJECT NO(S):
(212) DRAWING NUMBERS:
(21) MAINTAINED BY:......................66 - NATIONAL PARK SERVICE
(22) OWNER:................................... 66 - NATIONAL PARK SERVICE
(1) STATE:............................................ 243 - MARYLAND
(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:
24031 MONTGOMERY
00000
2 6 0 00000 0
C&O CANAL
CARDEROCK PICNIC AREA ACCESS
ROAD
3100052P0000000
Carderock Picnic Area
11.75 FT ( 3.58 M)
10.40 (KM PT: 3.17 )
3 - ON FREE ROAD
5 - NOT ELIGIBLE
STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE
(43A) MAIN STR. MATERIAL:..........1 - CONCRETE
(43B) MAIN STR. TYPE:.................. 18 - TUNNEL
(45) NO. OF MAIN SPANS:
(48) MAX. SPAN LENGTH:..............26 FT ( 7.9 M)
(49) STRUCTURE LENGTH:........... 124. FT ( 37.8 M)
(216A) ABUTMENT #1 FDN:........... 6 - N/A
(216B) ABUTMENT #2 FDN:........... 6 - N/A
(217A) PREDOM. PIER FDN:.......... 6 - N/A
(217B) SECOND. PIER FDN:.......... 6 - N/A
(107) DECK TYPE:.......................... N - NOT APPLICABLE
(44A) APPR. STR. MATERIAL:............ 0 - Other
(44B) APPR. STR. TYPE:.................... 00 - OTHER
(46) NO OF APPROACH SPANS:
(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:.........................0 - UNKNOWN (41) LOAD RESTRICTION:.................. A - OPEN
(66) INVENTORY RATING:.............. METRIC TONS) (70) BRIDGE POSTING:...................... 5 - EQUAL TO OR ABOVE LEGALTONS ( 0
LOADS
(64) OPERATING RATING:.............. TONS ( 0 METRIC TONS)
INSPECTION DATES
(90) INSPECTION DATE: 11/21/2023 (91) FREQ. OF INSP: 24 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):
(219) ADD. STUDIES NEEDED: N - (A) FRACTURE CRITICAL:.......... N
(220) SPECIAL STUDY TYPE: INSP. EVERY MONTHS - LAST INSP:
(221) SPECIAL STUDY DATE: (B) UNDERWATER:..................... N
INSP. EVERY MONTHS - LAST INSP:
(C) SPECIAL INSPECTION:........ N
Structure No. 3100-052 Inspection Date 11/21/2023
By: MM, WM
Element/ Str. Unit
Element/Structure Unit Description
Total Qty
Units Condition State Quantity
CS 1 CS 2 CS 3 CS 4
10001 Cast In Place Concrete 2850 SF 2500 350
Leakage 100
Delamination/Spall/Patched Area 10
Exposed Rebar 10
Efflorescence 100
Cracking 130
10051 Concrete Portal 1384 SF 1254 105 25
Delamination / Spall / Patch 15 10
Efflorescence 20 15
Cracking 70
10061 Concrete Ceiling Slab 3422 SF 3349 67 6
Delamination / Spall / Patch 16 6
Exposed Rebar 3
Efflorescence 20
Cracking 28
10158 AC Wearing Surface 3422 SF 3422
10300 Drainage 1 EA 1
10850 Traffic Signs 4 EA 2 2
Inspector: Marcus Miller Structure Number: 3100052P0000000
Inspection Date: 11/21/2023 Facility Carried: CARDEROCK PICNIC A
Tunnel Inspection Report
Pictures
PHOTO 3
Description CANAL VIEW OVER TUNNEL LOOKING WEST
PHOTO 4
Description GENERAL VIEW OF TUNNEL SLAB LOOKING SOUTH
Tunnel Inspection Report
Pictures
PHOTO 5
Description WATER PONDING IN SOUTHWEST AND NORTHEAST CORNERS OF TUNNEL, SOUTHWEST
CORNER SHOWN
PHOTO 6
Description TYPICAL CRACKING AND EFFLORESCENCE ON PORTALS, SOUTHWEST CORNER SHOWN
Tunnel Inspection Report
Pictures
PHOTO 7
Description SPALL ON CROWN OF NORTH PORTAL OVER SOUTHBOUND LANE
PHOTO 8
Description UP TO 1" GAP BETWEEN WINGWALLS AND NORTH PORTAL, NORTHWEST CORNER
SHOWN
Tunnel Inspection Report
Pictures
PHOTO 9
Description CRACKING WITH EFFLORESCENCE AND DELAMINATION (2' X6") AT WEST SIDE OF NORTH
PORTAL
PHOTO 10
Description GENERAL UNDERSIDE VIEW OF TUNNEL LOOKING NORTH; NOTE VEHICLE SCRAPE
MARKS
Tunnel Inspection Report
Pictures
PHOTO 11
Description TYPICAL REBAR CHAIRS EXPOSURE ALONG SLAB UNDERSIDE, 20' FROM SOUTH PORTAL
SHOWN
PHOTO 12
Description FULL WIDTH TRANSVERSE CRACK ON SLAB UNDERSIDE, MID-LENGTH; NOTE
EFFLORESCENCE
Tunnel Inspection Report
Pictures
PHOTO 13
Description SPALL WITH EXPOSED REBAR ON SLAB UNDERSIDE OVER SOUTHBOUND LANE, 40'
FROM NORTH PORTAL
PHOTO 14
Description EAST LINING; NOTE BARRIERS PROTECTING 18" PIPE RUNNING ALONG EAST LINING
Tunnel Inspection Report
Pictures
PHOTO 15
Description WEST LINING
PHOTO 16
Description 18" PIPE RUNNING ALONG EAST LINING
Tunnel Inspection Report
Pictures
PHOTO 17
Description VERTICAL CRACKS WITH ACTIVE LEAKAGE AND EFFLORESCENCE ON EAST LINING NEAR
MID-LENGTH, 3 OF 4 CRACKS SHOWN
PHOTO 18
Description WEST LINING, 25FT FROM NORTH END, NOTE VERTICAL CRACK WITH EFFLORESCENCE
Tunnel Inspection Report
Pictures
PHOTO 19
Description SPALL WITH EXPOSED REBAR ON BOTTOM OF WEST LINING NEAR NORTH END
PHOTO 20
Description TYPICAL CLOGGED DRAINAGE INLETS AT APPROACHS, SOUTHWEST INLET SHOWN
Tunnel Inspection Report
Pictures
PHOTO 21
Description DETERIORATION OF MORTAR JOINTS, UP TO 2" VOID, AND VEGETATION GROWTH AT
SOUTHEAST MASONRY WINGWALL
PHOTO 22
Description NORTHWEST AND BOTH SOUTH APPROACH OBJECT MARKERS ARE IMPROPERLY
ORIENTED, SOUTHEAST CORNER SHOWN
Tunnel Inspection Report
Pictures
PHOTO 23
Description VERTICAL CLEARANCE SIGN AT NORTH APPROACH
File details come from the government source that posted it. Updated .