Williamsport/pile over Iliamna River

Lake and Peninsula Borough, Alaska · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Williamsport/pile over Iliamna River in Lake and Peninsula Borough, Alaska, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 2019, making it 6 years old at the 2025 inventory.
• It carries about 20 vehicles a day (traffic count year 2019).
• 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.
• 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 → (59.75838, -153.84638)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.

Busiest bridges in Lake and Peninsula Borough

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.