US Bridges

Seward Highway over Summit Creek

Good

Kenai Peninsula Borough, Alaska · Mile Point 42.2 · Structure no. 4011

Built
1983
42 years old
Condition
Good
inspected August 2023
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
3,430
2020 count
Owner
State
State Highway Agency

About this bridge

Seward Highway over Summit Creek is a steel culvert carrying Seward Highway over Summit Creek in Kenai Peninsula Borough, Alaska. It was built in 1983, so it is 42 years old, older 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 3,430 vehicles a day, roughly 6% of them trucks, projected to reach 5,270 by 2039. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSeward Highway
CrossesSummit Creek
LocationMile Point 42.2
RouteInterstate 0A32
StateAlaska
Coordinates60.59944, -149.54111
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.8 m)
Longest span10 ft (2.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,430 (2020)
Projected traffic5,270 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Seward Highway over Summit Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Seward Highway over Summit Creek 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 August 2023.

How much traffic does Seward Highway over Summit Creek carry?

About 3,430 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Seward Highway over Summit Creek?

The structure is 22 ft (6.8 m) long with a longest span of 10 ft (2.9 m).

Who owns Seward Highway over Summit Creek?

It is owned by the State Highway Agency.