US Bridges

Sterling Highway over Crooked Creek

Good

Kenai Peninsula Borough, Alaska · Mile Point 72.4 · Structure no. 4070

Built
2019
6 years old
Condition
Good
inspected August 2023
Type
Culvert
Steel
Length
35 ft
1 main span
Daily traffic
5,770
2020 count
Owner
State
State Highway Agency

About this bridge

Sterling Highway over Crooked Creek is a steel culvert carrying Sterling Highway over Crooked Creek in Kenai Peninsula Borough, Alaska. It was built in 2019, so it is 6 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,770 vehicles a day, roughly 8% of them trucks, projected to reach 6,570 by 2039. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSterling Highway
CrossesCrooked Creek
LocationMile Point 72.4
RouteInterstate 21
StateAlaska
Coordinates60.30222, -151.27167
Functional classRural Principal Arterial - Other

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.
Culvert9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating101.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHL 93
Structure length35 ft (10.7 m)
Longest span35 ft (10.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,770 (2020)
Projected traffic6,570 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sterling Highway over Crooked Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is Sterling Highway over Crooked 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 Sterling Highway over Crooked Creek carry?

About 5,770 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Sterling Highway over Crooked Creek?

The structure is 35 ft (10.7 m) long with a longest span of 35 ft (10.7 m).

Who owns Sterling Highway over Crooked Creek?

It is owned by the State Highway Agency.