I-5 (Hwy 1) SB over Santiam Overflow No. 3

Marion County, Oregon · rated Fair in the 2025 National Bridge Inventory

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

• I-5 (Hwy 1) SB over Santiam Overflow No. 3 in Marion County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 1958 and reconstructed in 1991, making it 67 years old at the 2025 inventory.
• It carries about 33,446 vehicles a day (traffic count year 2022).
• Its listed owner is the state highway agency.
• It is one of 262 of the 375 inventoried bridges in Marion County rated fair (69.9%); 29 (7.7%) 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 → (44.74352, -123.05227)

Component ratings

Bridge details

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

Busiest bridges in Marion County

All bridges nearby: Marion County, OR bridge conditions · every bridge in Marion County · Oregon bridges.

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