US Bridges

Alaska Highway over Cathedral Rapids No 3

Good

Southeast Fairbanks Census Area, Alaska · Mile Point 114.9 · Structure no. 0511

Built
1985
40 years old
Condition
Good
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
230
2020 count
Owner
State
State Highway Agency

About this bridge

Alaska Highway over Cathedral Rapids No 3 is a prestressed concrete tee beam carrying Alaska Highway over Cathedral Rapids No 3 in Southeast Fairbanks Census Area, Alaska. It was built in 1985, so it is 40 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 230 vehicles a day, roughly 19% of them trucks, projected to reach 600 by 2039. The structure is 68 ft (20.7 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesAlaska Highway
CrossesCathedral Rapids No 3
LocationMile Point 114.9
RouteInterstate 0A21
StateAlaska
Coordinates63.38803, -143.76364
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.7 US tons
Inventory rating41.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length68 ft (20.7 m)
Longest span66 ft (20.1 m)
Deck width37 ft (11.2 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2020)
Projected traffic600 by 2039
Trucks19%
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 Alaska Highway over Cathedral Rapids No 3 built?

It was built in 1985, making it 40 years old in 2025.

What condition is Alaska Highway over Cathedral Rapids No 3 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 July 2024.

How much traffic does Alaska Highway over Cathedral Rapids No 3 carry?

About 230 vehicles per day (2020 count), of which roughly 19% are trucks.

How long is Alaska Highway over Cathedral Rapids No 3?

The structure is 68 ft (20.7 m) long with a longest span of 66 ft (20.1 m) and a deck 37 ft wide.

Who owns Alaska Highway over Cathedral Rapids No 3?

It is owned by the State Highway Agency.