SR 27 over Missouri Flat CR

Whitman County, Washington · rated Fair in the 2025 National Bridge Inventory

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

• SR 27 over Missouri Flat CR in Whitman County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 1955, making it 70 years old at the 2025 inventory.
• It carries about 17,702 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 154 of the 349 inventoried bridges in Whitman County rated fair (44.1%); 13 (3.7%) are rated poor.
• A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

View this bridge on a map → (46.73439, -117.17756)

Component ratings

Bridge details

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

Busiest bridges in Whitman County

All bridges nearby: Whitman County, WA bridge conditions · every bridge in Whitman County · Washington bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.