US Bridges

Steese Highway over North Fork 12 Mile Creek

Fair

Yukon-Koyukuk Census Area, Alaska · Mile Point 80.1 · Structure no. 0275

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
123 ft
3 main spans
Daily traffic
100
2020 count
Owner
State
State Highway Agency

About this bridge

Steese Highway over North Fork 12 Mile Creek is a steel stringer/multi-beam or girder carrying Steese Highway over North Fork 12 Mile Creek in Yukon-Koyukuk Census Area, Alaska. It was built in 1961, so it is 64 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 100 vehicles a day, roughly 13% of them trucks, projected to reach 140 by 2039. The structure is 123 ft (37.5 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSteese Highway
CrossesNorth Fork 12 Mile Creek
LocationMile Point 80.1
RouteState Highway 670
StateAlaska
Coordinates65.40019, -145.74027
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.6 US tons
Inventory rating35.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span50 ft (15.2 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic140 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 Steese Highway over North Fork 12 Mile Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Steese Highway over North Fork 12 Mile Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does Steese Highway over North Fork 12 Mile Creek carry?

About 100 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is Steese Highway over North Fork 12 Mile Creek?

The structure is 123 ft (37.5 m) long with a longest span of 50 ft (15.2 m) and a deck 32 ft wide.

Who owns Steese Highway over North Fork 12 Mile Creek?

It is owned by the State Highway Agency.