US Bridges

Parks Highway over Unnamed Creek

Good

Matanuska-Susitna Borough, Alaska · Mile Point 121.1 · Structure no. 4141

Built
1966
59 years old
Condition
Good
inspected June 2024
Type
Culvert
Steel
Length
24 ft
3 main spans
Daily traffic
1,650
2020 count
Owner
State
State Highway Agency

About this bridge

Parks Highway over Unnamed Creek is a steel culvert carrying Parks Highway over Unnamed Creek in Matanuska-Susitna Borough, Alaska. It was built in 1966, so it is 59 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,650 vehicles a day, roughly 6% of them trucks, projected to reach 2,990 by 2039. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesParks Highway
CrossesUnnamed Creek
LocationMile Point 121.1
RouteInterstate 0A42
StateAlaska
Coordinates62.40335, -150.25938
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2020)
Projected traffic2,990 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Parks Highway over Unnamed Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Parks Highway over Unnamed 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 Parks Highway over Unnamed Creek carry?

About 1,650 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Parks Highway over Unnamed Creek?

The structure is 24 ft (7.3 m) long with a longest span of 6 ft (1.8 m).

Who owns Parks Highway over Unnamed Creek?

It is owned by the State Highway Agency.