US Bridges

Seward Highway over Bird Point Overhead

Good

Anchorage Municipality, Alaska · Mile Point 95.3 · Structure no. 1950

Built
1998
27 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
109 ft
1 main span
Daily traffic
6,660
2020 count
Owner
State
State Highway Agency

About this bridge

Seward Highway over Bird Point Overhead is a prestressed concrete tee beam carrying Seward Highway over Bird Point Overhead in Anchorage Municipality, Alaska. It was built in 1998, so it is 27 years old, younger than the Alaska average of 35.9 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 6,660 vehicles a day, roughly 8% of them trucks, projected to reach 7,590 by 2039. The structure is 109 ft (33.1 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSeward Highway
CrossesBird Point Overhead
LocationMile Point 95.3
RouteInterstate 0A31
StateAlaska
Coordinates60.92972, -149.34194
Functional classRural Principal Arterial - Interstate

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.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating56.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length109 ft (33.1 m)
Longest span104 ft (31.8 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,660 (2020)
Projected traffic7,590 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Seward Highway over Bird Point Overhead built?

It was built in 1998, making it 27 years old in 2025.

What condition is Seward Highway over Bird Point Overhead 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 June 2023.

How much traffic does Seward Highway over Bird Point Overhead carry?

About 6,660 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Seward Highway over Bird Point Overhead?

The structure is 109 ft (33.1 m) long with a longest span of 104 ft (31.8 m) and a deck 44 ft wide.

Who owns Seward Highway over Bird Point Overhead?

It is owned by the State Highway Agency.