US Bridges

Dangerous River RD over Antlen River

Good

Yakutat City and Borough, Alaska · Mile Point 24.6 · Structure no. 1228

Built
1974
51 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
109 ft
3 main spans
Daily traffic
40
2020 count
Owner
State
State Highway Agency

About this bridge

Dangerous River RD over Antlen River is a steel continuous stringer/multi-beam or girder carrying Dangerous River RD over Antlen River in Yakutat City and Borough, Alaska. It was built in 1974, so it is 51 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 40 vehicles a day, roughly 33% of them trucks, projected to reach 50 by 2039. The structure is 109 ft (33.3 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesDangerous River RD
CrossesAntlen River
LocationMile Point 24.6
RouteState Highway 942
StateAlaska
Coordinates59.4625, -139.11068
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating39.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length109 ft (33.3 m)
Longest span42 ft (12.8 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic50 by 2039
Trucks33%
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 Dangerous River RD over Antlen River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Dangerous River RD over Antlen River 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 May 2024.

How much traffic does Dangerous River RD over Antlen River carry?

About 40 vehicles per day (2020 count), of which roughly 33% are trucks.

How long is Dangerous River RD over Antlen River?

The structure is 109 ft (33.3 m) long with a longest span of 42 ft (12.8 m) and a deck 29 ft wide.

Who owns Dangerous River RD over Antlen River?

It is owned by the State Highway Agency.