US Hwy 91 N over Dry Fork Marias 080

Pondera County, Montana · rated Fair in the 2025 National Bridge Inventory

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

• US Hwy 91 N over Dry Fork Marias 080 in Pondera County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1931 and reconstructed in 1951, making it 94 years old at the 2025 inventory.
• It carries about 511 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 43 of the 96 inventoried bridges in Pondera County rated fair (44.8%); 4 (4.2%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• Its condition class and component ratings are unchanged from the 2024 inventory.
• Its most recent inspection on record is dated November 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 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 → (48.21481, -111.94516)

Component ratings

Bridge details

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

Busiest bridges in Pondera County

All bridges nearby: Pondera County, MT bridge conditions · every bridge in Pondera County · Montana bridges.

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