US Bridges

91 Mile Loop over Little Tok River

PoorPosted for load

County 066, Alaska · Old Tok Alignment MP0.0 · Structure no. 0658

Built
1979
46 years old
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
84 ft
1 main span
Daily traffic
336
2018 count
Owner
State
State Highway Agency

About this bridge

91 Mile Loop over Little Tok River is a steel stringer/multi-beam or girder carrying 91 Mile Loop over Little Tok River in County 066, Alaska. It was built in 1979, so it is 46 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. Its operating status is: posted for load restriction.

It carries about 336 vehicles a day, roughly 21% of them trucks, projected to reach 400 by 2035. The structure is 84 ft (25.6 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Carries91 Mile Loop
CrossesLittle Tok River
LocationOld Tok Alignment MP0.0
RouteState Highway NSP00
StateAlaska
Coordinates62.96028, -143.35333
Functional classRural Local

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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.2 US tons
Inventory rating22 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length84 ft (25.6 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic336 (2018)
Projected traffic400 by 2035
Trucks21%
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 91 Mile Loop over Little Tok River built?

It was built in 1979, making it 46 years old in 2025.

What condition is 91 Mile Loop over Little Tok River 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 July 2023.

How much traffic does 91 Mile Loop over Little Tok River carry?

About 336 vehicles per day (2018 count), of which roughly 21% are trucks.

How long is 91 Mile Loop over Little Tok River?

The structure is 84 ft (25.6 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns 91 Mile Loop over Little Tok River?

It is owned by the State Highway Agency.