Williamsport/pile over Timberline Creek
Lake and Peninsula Borough, Alaska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Williamsport/pile over Timberline Creek in Lake and Peninsula Borough, Alaska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1981, making it 44 years old at the 2025 inventory.
- It carries about 20 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 5 of the 10 inventoried bridges in Lake and Peninsula Borough rated good (50.0%); 1 (10.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: superstructure 7 to 8.
- Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (59.72839, -153.80534)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 30 ft |
| Location | Mile Point 7.6 |
| NBI structure number | 1321 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Lake and Peninsula Borough
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Iliamna Village Sp over Iliamnavillagespurrd_roa | 1976 | 275 | Good |
| Iliamna Village Rd over Iliamnavillagerd_roadhou | 1976 | 143 | Good |
| Irr:airport Road over Perryville Creek | 1981 | 77 | Good |
| Irr:newhalen Road over North Fork Alexcy Creek | 1985 | 50 | Fair |
| Irr:anderson Rd over Indian Creek | 1985 | 45 | Poor |
| Irr:anderson Rd over Chignik Creek | 2002 | 45 | Fair |
All bridges nearby: Lake and Peninsula Borough, AK bridge conditions · every bridge in Lake and Peninsula Borough · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.