Gwmp (sb) over Boundary Channel

Fair

District of Columbia, District of Columbia · 1.0 Miles North of I-395. · Structure no. 3300019P0000000

Built: 1965; 60 years old
Condition: Fair; inspected March 2023
Type: Box Beam or Girders - Single or Spread; Concrete Continuous
Length: 355 ft; 3 main spans
Daily traffic: 33,452; 2022 count
Owner: Federal; National Park Service

About this bridge

Gwmp (sb) over Boundary Channel is a concrete continuous box beam or girders - single or spread carrying Gwmp (sb) over Boundary Channel in District of Columbia, District of Columbia. It was built in 1965, so it is 60 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 6 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 33,452 vehicles a day, roughly 1% of them trucks, projected to reach 40,143 by 2042. The structure is 355 ft (108.2 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGwmp (sb)

CrossesBoundary Channel

Location1.0 Miles North of I-395.

RouteFederal Lands Road 1

CountyDistrict of Columbia

StateDistrict of Columbia

Coordinates38.88294, -77.05761

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionMarch 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 rating72 US tons

Inventory rating43 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length355 ft (108.2 m)

Longest span140 ft (42.7 m)

Deck width38 ft (11.6 m)

Roadway width28 ft (8.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,452 (2022)

Projected traffic40,143 by 2042

Trucks1%

Lanes on structure2

Traffic directionOne-way traffic

CarriesHighway and pedestrian

CrossesWaterway

Detour if closed1.2 mi (2 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 proposedNone recorded

Estimated improvement cost$180,000

NavigationNo navigation control on waterway

Frequently asked questions

When was Gwmp (sb) over Boundary Channel built?

It was built in 1965, making it 60 years old in 2025.

What condition is Gwmp (sb) 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 March 2023.

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

About 33,452 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Gwmp (sb) over Boundary Channel?

The structure is 355 ft (108.2 m) long with a longest span of 140 ft (42.7 m) and a deck 38 ft wide.

Who owns Gwmp (sb) over Boundary Channel?

It is owned by the National Park Service.