US Bridges

8430000 over Perm

Fair

Ketchikan Gateway Borough, Alaska · Shoal Cove · Structure no. 100520000001145

Built
1982
43 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
71 ft
1 main span
Daily traffic
5
2006 count
Owner
Federal
U.S. Forest Service

About this bridge

8430000 over Perm is a wood or timber stringer/multi-beam or girder carrying 8430000 over Perm in Ketchikan Gateway Borough, Alaska. It was built in 1982, so it is 43 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5 vehicles a day, projected to reach 10 by 2013. The structure is 71 ft (21.6 m) long and 18 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
Carries8430000
CrossesPerm
LocationShoal Cove
RouteFederal Lands Road 84300
CountyKetchikan Gateway Borough
StateAlaska
Coordinates55.3926, -131.2936
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.1 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadOther
Structure length71 ft (21.6 m)
Longest span67 ft (20.5 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2006)
Projected traffic10 by 2013
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-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$182,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 8430000 over Perm built?

It was built in 1982, making it 43 years old in 2025.

What condition is 8430000 over Perm in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does 8430000 over Perm carry?

About 5 vehicles per day (2006 count).

How long is 8430000 over Perm?

The structure is 71 ft (21.6 m) long with a longest span of 67 ft (20.5 m) and a deck 18 ft wide.

Who owns 8430000 over Perm?

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