US Bridges

Seward Highway over Campbell Creek - NB

Good

Anchorage Municipality, Alaska · Mile Point 123.8 · Structure no. 1160

Built
2013
12 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
146 ft
1 main span
Daily traffic
23,850
2020 count
Owner
State
State Highway Agency

About this bridge

Seward Highway over Campbell Creek - NB is a prestressed concrete tee beam carrying Seward Highway over Campbell Creek - NB in Anchorage Municipality, Alaska. It was built in 2013, so it is 12 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 23,850 vehicles a day, roughly 17% of them trucks, projected to reach 38,000 by 2039. The structure is 146 ft (44.5 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSeward Highway
CrossesCampbell Creek - NB
LocationMile Point 123.8
RouteInterstate 0a31
StateAlaska
Coordinates61.17556, -149.85861
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.
Superstructure8 Very GoodNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating63.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length146 ft (44.5 m)
Longest span142 ft (43.3 m)
Deck width71 ft (21.5 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,850 (2020)
Projected traffic38,000 by 2039
Trucks17%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Seward Highway over Campbell Creek - NB built?

It was built in 2013, making it 12 years old in 2025.

What condition is Seward Highway over Campbell Creek - NB 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 Campbell Creek - NB carry?

About 23,850 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is Seward Highway over Campbell Creek - NB?

The structure is 146 ft (44.5 m) long with a longest span of 142 ft (43.3 m) and a deck 71 ft wide.

Who owns Seward Highway over Campbell Creek - NB?

It is owned by the State Highway Agency.