US Bridges

Parks Highway over Jack River

Fair

Denali Borough, Alaska · Mile Point 174.1 · Structure no. 0302

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
197 ft
3 main spans
Daily traffic
900
2020 count
Owner
State
State Highway Agency

About this bridge

Parks Highway over Jack River is a steel stringer/multi-beam or girder carrying Parks Highway over Jack River in Denali Borough, Alaska. It was built in 1965, so it is 60 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 6 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 900 vehicles a day, roughly 37% of them trucks, projected to reach 1,130 by 2039. The structure is 197 ft (60 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesParks Highway
CrossesJack River
LocationMile Point 174.1
RouteInterstate 0A43
StateAlaska
Coordinates63.38579, -148.90891
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.9 US tons
Inventory rating31.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length197 ft (60 m)
Longest span65 ft (19.8 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2020)
Projected traffic1,130 by 2039
Trucks37%
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 Jack River built?

It was built in 1965, making it 60 years old in 2025.

What condition is Parks Highway over Jack River 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 Parks Highway over Jack River carry?

About 900 vehicles per day (2020 count), of which roughly 37% are trucks.

How long is Parks Highway over Jack River?

The structure is 197 ft (60 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.

Who owns Parks Highway over Jack River?

It is owned by the State Highway Agency.