US Bridges

Shirley Towne DR over Willow Creek

FairPosted for load

Matanuska-Susitna Borough, Alaska · Matsu Borough · Structure no. 1831

Built
1987
38 years old, rebuilt 2021
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
252 ft
5 main spans
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

Shirley Towne DR over Willow Creek is a steel stringer/multi-beam or girder carrying Shirley Towne DR over Willow Creek in Matanuska-Susitna Borough, Alaska. It was built in 1987 and reconstructed in 2021, so it is 38 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, roughly 1% of them trucks, projected to reach 25 by 2035. The structure is 252 ft (76.9 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesShirley Towne DR
CrossesWillow Creek
LocationMatsu Borough
RouteCounty Highway 0
StateAlaska
Coordinates61.77526, -149.91022
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.1 US tons
Inventory rating30.5 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans5
Design loadHS 20
Structure length252 ft (76.9 m)
Longest span77 ft (23.5 m)
Deck width14 ft (4.4 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic25 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 Shirley Towne DR over Willow Creek built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2021.

What condition is Shirley Towne DR over Willow 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 June 2024.

How much traffic does Shirley Towne DR over Willow Creek carry?

About 20 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Shirley Towne DR over Willow Creek?

The structure is 252 ft (76.9 m) long with a longest span of 77 ft (23.5 m) and a deck 14 ft wide.

Who owns Shirley Towne DR over Willow Creek?

It is owned by the County Highway Agency.