US Bridges

Willow/Fishhook RD over Willow Creek

Poor

Matanuska-Susitna Borough, Alaska · Mile Point 34.7 · Structure no. 0278

Built
1975
50 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
190
2020 count
Owner
State
State Highway Agency

About this bridge

Willow/Fishhook RD over Willow Creek is a prestressed concrete tee beam carrying Willow/Fishhook RD over Willow Creek in Matanuska-Susitna Borough, Alaska. It was built in 1975, so it is 50 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 190 vehicles a day, roughly 17% of them trucks, projected to reach 220 by 2039. The structure is 110 ft (33.5 m) long and 25 ft wide. If it were closed, the detour would be 72.7 mi (117 km).

Location

Open in Google Maps
CarriesWillow/Fishhook RD
CrossesWillow Creek
LocationMile Point 34.7
RouteState Highway 580
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates61.7615, -149.67472
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.1 US tons
Inventory rating32.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span104 ft (31.7 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2020)
Projected traffic220 by 2039
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed72.7 mi (117 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 Willow/Fishhook RD over Willow Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Willow/Fishhook RD over Willow Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Willow/Fishhook RD over Willow Creek carry?

About 190 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is Willow/Fishhook RD over Willow Creek?

The structure is 110 ft (33.5 m) long with a longest span of 104 ft (31.7 m) and a deck 25 ft wide.

Who owns Willow/Fishhook RD over Willow Creek?

It is owned by the State Highway Agency.