US Bridges

Knik River Road over Hunter Creek

Fair

Matanuska-Susitna Borough, Alaska · Mile Point 9.6 · Structure no. 1253

Built
1995
30 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
230
2020 count
Owner
State
State Highway Agency

About this bridge

Knik River Road over Hunter Creek is a steel stringer/multi-beam or girder carrying Knik River Road over Hunter Creek in Matanuska-Susitna Borough, Alaska. It was built in 1995, so it is 30 years old, younger 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.

It carries about 230 vehicles a day, roughly 8% of them trucks, projected to reach 260 by 2039. The structure is 81 ft (24.7 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesKnik River Road
CrossesHunter Creek
LocationMile Point 9.6
RouteState Highway NSP00
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates61.44178, -148.80917
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 protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.8 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length81 ft (24.7 m)
Longest span78 ft (23.8 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2020)
Projected traffic260 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 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 Knik River Road over Hunter Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Knik River Road over Hunter 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 Knik River Road over Hunter Creek carry?

About 230 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Knik River Road over Hunter Creek?

The structure is 81 ft (24.7 m) long with a longest span of 78 ft (23.8 m) and a deck 26 ft wide.

Who owns Knik River Road over Hunter Creek?

It is owned by the State Highway Agency.