US Bridges

River Road over Big Annemessex River

Good

Somerset County, Maryland · 1.5 MI N of Kingston Road · Structure no. 200000S-0004010

Built
1988
37 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete
Length
202 ft
8 main spans
Daily traffic
484
2021 count
Owner
County
County Highway Agency

About this bridge

River Road over Big Annemessex River is a concrete slab carrying River Road over Big Annemessex River in Somerset County, Maryland. It was built in 1988, so it is 37 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 484 vehicles a day, roughly 5% of them trucks, projected to reach 652 by 2041. The structure is 202 ft (61.6 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesRiver Road
CrossesBig Annemessex River
Location1.5 MI N of Kingston Road
RouteCounty Highway 304
Coordinates38.08777, -75.74671
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating83.4 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans8
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic484 (2021)
Projected traffic652 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was River Road over Big Annemessex River built?

It was built in 1988, making it 37 years old in 2025.

What condition is River Road over Big Annemessex River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does River Road over Big Annemessex River carry?

About 484 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is River Road over Big Annemessex River?

The structure is 202 ft (61.6 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns River Road over Big Annemessex River?

It is owned by the County Highway Agency.