US Bridges

Gwmp (nb) over Boundary Channel

Fair

District of Columbia, District of Columbia · 1.7 Miles North of I-395. · Structure no. 3300013P0000000

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
117 ft
1 main span
Daily traffic
19,800
2007 count
Owner
Federal
National Park Service

About this bridge

Gwmp (nb) over Boundary Channel is a steel stringer/multi-beam or girder carrying Gwmp (nb) over Boundary Channel in District of Columbia, District of Columbia. It was built in 1964, so it is 61 years old, younger than the District of Columbia average of 63.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 19,800 vehicles a day, roughly 1% of them trucks, projected to reach 21,780 by 2027. The structure is 117 ft (35.8 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGwmp (nb)
CrossesBoundary Channel
Location1.7 Miles North of I-395.
RouteFederal Lands Road 2
CountyDistrict of Columbia
StateDistrict of Columbia
Coordinates38.88947, -77.06456
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating88 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 20
Structure length117 ft (35.8 m)
Longest span117 ft (35.8 m)
Deck width38 ft (11.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,800 (2007)
Projected traffic21,780 by 2027
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$308,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Gwmp (nb) over Boundary Channel built?

It was built in 1964, making it 61 years old in 2025.

What condition is Gwmp (nb) over Boundary Channel in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Gwmp (nb) over Boundary Channel carry?

About 19,800 vehicles per day (2007 count), of which roughly 1% are trucks.

How long is Gwmp (nb) over Boundary Channel?

The structure is 117 ft (35.8 m) long with a longest span of 117 ft (35.8 m) and a deck 38 ft wide.

Who owns Gwmp (nb) over Boundary Channel?

It is owned by the National Park Service.