US Bridges

3000000-28.30 over Perm

Good

Prince of Wales-Hyder Census Area, Alaska · Thorne Bay · Structure no. 100540000001075

Built
1991
34 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
65 ft
1 main span
Daily traffic
50
2006 count
Owner
Federal
U.S. Forest Service

About this bridge

3000000-28.30 over Perm is a wood or timber stringer/multi-beam or girder carrying 3000000-28.30 over Perm in Prince of Wales-Hyder Census Area, 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 50 vehicles a day, projected to reach 155 by 2013. The structure is 65 ft (19.8 m) long and 30 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Carries3000000-28.30
CrossesPerm
LocationThorne Bay
RouteFederal Lands Road 30000
StateAlaska
Coordinates55.81269, -132.51576
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating85 US tons
Inventory rating65.7 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadOther
Structure length65 ft (19.8 m)
Longest span63 ft (19.1 m)
Deck width30 ft (9.1 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2006)
Projected traffic155 by 2013
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$168,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 3000000-28.30 over Perm built?

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

What condition is 3000000-28.30 over Perm 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 September 2023.

How much traffic does 3000000-28.30 over Perm carry?

About 50 vehicles per day (2006 count).

How long is 3000000-28.30 over Perm?

The structure is 65 ft (19.8 m) long with a longest span of 63 ft (19.1 m) and a deck 30 ft wide.

Who owns 3000000-28.30 over Perm?

It is owned by the U.S. Forest Service.