US Bridges

Oilwell Road over Twin Creek

Good

Matanuska-Susitna Borough, Alaska · Mile Point 9.6 · Structure no. 2206

Built
2010
15 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
10
2018 count
Owner
County
County Highway Agency

About this bridge

Oilwell Road over Twin Creek is a steel stringer/multi-beam or girder carrying Oilwell Road over Twin Creek in Matanuska-Susitna Borough, Alaska. It was built in 2010, so it is 15 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 10 vehicles a day, roughly 1% of them trucks, projected to reach 12 by 2035. The structure is 40 ft (12.2 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesOilwell Road
CrossesTwin Creek
LocationMile Point 9.6
StateAlaska
Coordinates62.19041, -150.49727
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating84.9 US tons

Structure

MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span38 ft (11.5 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic12 by 2035
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Oilwell Road over Twin Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Oilwell Road over Twin 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 June 2024.

How much traffic does Oilwell Road over Twin Creek carry?

About 10 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Oilwell Road over Twin Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.5 m) and a deck 16 ft wide.

Who owns Oilwell Road over Twin Creek?

It is owned by the County Highway Agency.