US Bridges

Md 450 over Severn River

Fair

Anne Arundel County, Maryland · 0.31 MI W of Md 648A · Structure no. 100000020070010

Built
1995
30 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
2,835 ft
17 main spans
Daily traffic
18,874
2017 count
Owner
State
State Highway Agency

About this bridge

Md 450 over Severn River is a steel continuous box beam or girders - multiple carrying Md 450 over Severn River in Anne Arundel County, Maryland. It was built in 1995, so it is 30 years old, younger 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 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 18,874 vehicles a day, roughly 6% of them trucks, projected to reach 20,908 by 2034. The structure is 2,835 ft (864.1 m) long and 55 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 450
CrossesSevern River
Location0.31 MI W of Md 648A
RouteState Highway 450
CountyAnne Arundel County
StateMaryland
Coordinates38.99133, -76.49172
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.5 US tons
Inventory rating27 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans17
Design loadHS 25 or greater
Structure length2,835 ft (864.1 m)
Longest span315 ft (96 m)
Deck width55 ft (16.8 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,874 (2017)
Projected traffic20,908 by 2034
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Md 450 over Severn River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Md 450 over Severn 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 March 2024.

How much traffic does Md 450 over Severn River carry?

About 18,874 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is Md 450 over Severn River?

The structure is 2,835 ft (864.1 m) long with a longest span of 315 ft (96 m) and a deck 55 ft wide.

Who owns Md 450 over Severn River?

It is owned by the State Highway Agency.