US Bridges

Seward Highway over 76th Ave Undercrossing

Good

Anchorage Municipality, Alaska · Mile Point 121.8 · Structure no. 2253

Built
2017
8 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
133 ft
1 main span
Daily traffic
41,300
2020 count
Owner
State
State Highway Agency

About this bridge

Seward Highway over 76th Ave Undercrossing is a prestressed concrete tee beam carrying Seward Highway over 76th Ave Undercrossing in Anchorage Municipality, Alaska. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 41,300 vehicles a day, roughly 2% of them trucks, projected to reach 26,750 by 2039. The structure is 133 ft (40.5 m) long and 140 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSeward Highway
Crosses76th Ave Undercrossing
LocationMile Point 121.8
RouteInterstate 0A31
StateAlaska
Coordinates61.15198, -149.85591
Functional classUrban 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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating96.7 US tons
Inventory rating44.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length133 ft (40.5 m)
Longest span130 ft (39.6 m)
Deck width140 ft (42.8 m)
Roadway width138 ft (42.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,300 (2020)
Projected traffic26,750 by 2039
Trucks2%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 76th Ave Undercrossing built?

It was built in 2017, making it 8 years old in 2025.

What condition is Seward Highway over 76th Ave Undercrossing 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 76th Ave Undercrossing carry?

About 41,300 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Seward Highway over 76th Ave Undercrossing?

The structure is 133 ft (40.5 m) long with a longest span of 130 ft (39.6 m) and a deck 140 ft wide.

Who owns Seward Highway over 76th Ave Undercrossing?

It is owned by the State Highway Agency.