US Bridges

Q Street N.W. over Rock Creek

Fair

District of Columbia, District of Columbia · Q St. over Rock Creek · Structure no. 0117

Built
1915
110 years old, rebuilt 2000
Condition
Fair
inspected August 2024
Type
Arch - Deck
Concrete
Length
265 ft
5 main spans
Daily traffic
12,000
2018 count
Owner
State
State Highway Agency

About this bridge

Q Street N.W. over Rock Creek is a concrete arch - deck carrying Q Street N.W. over Rock Creek in District of Columbia, District of Columbia. It was built in 1915 and reconstructed in 2000, so it is 110 years old, older 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 12,000 vehicles a day, roughly 1% of them trucks, projected to reach 12,000 by 2027. The structure is 265 ft (80.8 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesQ Street N.W.
CrossesRock Creek
LocationQ St. over Rock Creek
RouteCity Street 0
Coordinates38.911, -77.05083
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span57 ft (17.4 m)
Deck width50 ft (15.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2018)
Projected traffic12,000 by 2027
Trucks1%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Q Street N.W. over Rock Creek built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 2000.

What condition is Q Street N.W. over Rock Creek 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 August 2024.

How much traffic does Q Street N.W. over Rock Creek carry?

About 12,000 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Q Street N.W. over Rock Creek?

The structure is 265 ft (80.8 m) long with a longest span of 57 ft (17.4 m) and a deck 50 ft wide.

Who owns Q Street N.W. over Rock Creek?

It is owned by the State Highway Agency.