US Bridges

Thorne Bay Road over Control Creek

Good

Prince of Wales-Hyder Census Area, Alaska · Mile Point 1.4 · Structure no. 1455

Built
1988
37 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
110 ft
1 main span
Daily traffic
190
2020 count
Owner
State
State Highway Agency

About this bridge

Thorne Bay Road over Control Creek is a steel stringer/multi-beam or girder carrying Thorne Bay Road over Control Creek in Prince of Wales-Hyder Census Area, Alaska. It was built in 1988, so it is 37 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 190 vehicles a day, roughly 26% of them trucks, projected to reach 230 by 2039. The structure is 110 ft (33.5 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesThorne Bay Road
CrossesControl Creek
LocationMile Point 1.4
RouteState Highway 929
StateAlaska
Coordinates55.69972, -132.84917
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 protection7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating71.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length110 ft (33.5 m)
Longest span104 ft (31.7 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2020)
Projected traffic230 by 2039
Trucks26%
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 Thorne Bay Road over Control Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Thorne Bay Road over Control 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 Thorne Bay Road over Control Creek carry?

About 190 vehicles per day (2020 count), of which roughly 26% are trucks.

How long is Thorne Bay Road over Control Creek?

The structure is 110 ft (33.5 m) long with a longest span of 104 ft (31.7 m) and a deck 30 ft wide.

Who owns Thorne Bay Road over Control Creek?

It is owned by the State Highway Agency.