US Bridges

College-Johansn NW over Noyes Slough NW Ramp

Good

Fairbanks North Star Borough, Alaska · Mile Point 0.1 · Structure no. 1806

Built
1991
34 years old
Condition
Good
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
99 ft
1 main span
Daily traffic
2,790
2020 count
Owner
State
State Highway Agency

About this bridge

College-Johansn NW over Noyes Slough NW Ramp is a prestressed concrete tee beam carrying College-Johansn NW over Noyes Slough NW Ramp in Fairbanks North Star Borough, Alaska. It was built in 1991, so it is 34 years old, younger 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 2,790 vehicles a day, roughly 3% of them trucks, projected to reach 3,580 by 2039. The structure is 99 ft (30.1 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCollege-Johansn NW
CrossesNoyes Slough NW Ramp
LocationMile Point 0.1
RouteState Highway 668
StateAlaska
Coordinates64.85644, -147.71796
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating41.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length99 ft (30.1 m)
Longest span95 ft (29 m)
Deck width39 ft (11.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,790 (2020)
Projected traffic3,580 by 2039
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 College-Johansn NW over Noyes Slough NW Ramp built?

It was built in 1991, making it 34 years old in 2025.

What condition is College-Johansn NW over Noyes Slough NW Ramp 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 August 2024.

How much traffic does College-Johansn NW over Noyes Slough NW Ramp carry?

About 2,790 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is College-Johansn NW over Noyes Slough NW Ramp?

The structure is 99 ft (30.1 m) long with a longest span of 95 ft (29 m) and a deck 39 ft wide.

Who owns College-Johansn NW over Noyes Slough NW Ramp?

It is owned by the State Highway Agency.