US Bridges

Big Salt Lake Road over Bennett Creek

Good

Prince of Wales-Hyder Census Area, Alaska · Mile Point 1.7 · Structure no. 1375

Built
1985
40 years old
Condition
Good
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
88 ft
1 main span
Daily traffic
680
2020 count
Owner
State
State Highway Agency

About this bridge

Big Salt Lake Road over Bennett Creek is a prestressed concrete tee beam carrying Big Salt Lake Road over Bennett Creek in Prince of Wales-Hyder 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 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 680 vehicles a day, roughly 15% of them trucks, projected to reach 1,830 by 2039. The structure is 88 ft (26.8 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBig Salt Lake Road
CrossesBennett Creek
LocationMile Point 1.7
RouteState Highway 929
StateAlaska
Coordinates55.56861, -133.06278
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating96.5 US tons
Inventory rating57.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length88 ft (26.8 m)
Longest span85 ft (25.9 m)
Deck width30 ft (9.1 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic680 (2020)
Projected traffic1,830 by 2039
Trucks15%
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 Big Salt Lake Road over Bennett Creek built?

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

What condition is Big Salt Lake Road over Bennett Creek 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 2023.

How much traffic does Big Salt Lake Road over Bennett Creek carry?

About 680 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Big Salt Lake Road over Bennett Creek?

The structure is 88 ft (26.8 m) long with a longest span of 85 ft (25.9 m) and a deck 30 ft wide.

Who owns Big Salt Lake Road over Bennett Creek?

It is owned by the State Highway Agency.