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I 380 NB Off Ramp over 8TH Ave SW

Linn County, Iowa · rated Fair in the 2025 National Bridge Inventory

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

I 380 NB Off Ramp over 8TH Ave SW in Linn County, Iowa, 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 1975, making it 50 years old at the 2025 inventory.
It carries about 8,500 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 295 of the 511 inventoried bridges in Linn County rated fair (57.7%); 34 (6.7%) 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.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 246 ft
Location	0.5 mi. S Jct. IA 922
NBI structure number	000000000605990
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-380 over E and F Ave NW Cedar Rvr	1979	57,600	Fair
SB I-380 over Cc RR & Ash Pit	1979	41,000	Fair
NB I-380 over Cc RR	1980	38,800	Fair
SB I-380 over Cc RR	1980	38,800	Fair
NB I-380 over H Ave NE	1980	38,800	Fair
SB I-380 over H Ave NE	1980	38,800	Good