US Bridges

US 40 Alt over Casselman River

Fair

Garrett County, Maryland · 0.82 Mile East of Md 495 · Structure no. 100000110007010

Built
1932
93 years old
Condition
Fair
inspected August 2023
Type
Truss - Thru
Steel
Length
137 ft
1 main span
Daily traffic
3,841
2014 count
Owner
State
State Highway Agency

About this bridge

US 40 Alt over Casselman River is a steel truss - thru carrying US 40 Alt over Casselman River in Garrett County, Maryland. It was built in 1932, so it is 93 years old, older than the Maryland average of 52.6 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 3,841 vehicles a day, roughly 8% of them trucks, projected to reach 4,687 by 2034. The structure is 137 ft (41.8 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 40 Alt
CrossesCasselman River
Location0.82 Mile East of Md 495
RouteU.S. Route 40
CountyGarrett County
StateMaryland
Coordinates39.69603, -79.14208
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.5 US tons
Inventory rating47.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length137 ft (41.8 m)
Longest span133 ft (40.5 m)
Deck width42 ft (12.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic3,841 (2014)
Projected traffic4,687 by 2034
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$377,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 40 Alt over Casselman River built?

It was built in 1932, making it 93 years old in 2025.

What condition is US 40 Alt over Casselman River 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 2023.

How much traffic does US 40 Alt over Casselman River carry?

About 3,841 vehicles per day (2014 count), of which roughly 8% are trucks.

How long is US 40 Alt over Casselman River?

The structure is 137 ft (41.8 m) long with a longest span of 133 ft (40.5 m) and a deck 42 ft wide.

Who owns US 40 Alt over Casselman River?

It is owned by the State Highway Agency.