US Bridges

Williamsport/Pile over Timberline Creek

Good

Lake and Peninsula Borough, Alaska · Mile Point 7.6 · Structure no. 1321

Built
1981
44 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
20
2018 count
Owner
State
State Highway Agency

About this bridge

Williamsport/Pile over Timberline Creek is a steel stringer/multi-beam or girder carrying Williamsport/Pile over Timberline Creek in Lake and Peninsula Borough, Alaska. It was built in 1981, so it is 44 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 20 vehicles a day, roughly 24% of them trucks, projected to reach 30 by 2035. The structure is 31 ft (9.4 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesWilliamsport/Pile
CrossesTimberline Creek
LocationMile Point 7.6
RouteState Highway SMR36
StateAlaska
Coordinates59.72839, -153.80534
Functional classRural Minor 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.8 US tons
Inventory rating28.9 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span27 ft (8.2 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic30 by 2035
Trucks24%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Williamsport/Pile over Timberline Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Williamsport/Pile over Timberline 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 2024.

How much traffic does Williamsport/Pile over Timberline Creek carry?

About 20 vehicles per day (2018 count), of which roughly 24% are trucks.

How long is Williamsport/Pile over Timberline Creek?

The structure is 31 ft (9.4 m) long with a longest span of 27 ft (8.2 m) and a deck 14 ft wide.

Who owns Williamsport/Pile over Timberline Creek?

It is owned by the State Highway Agency.