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Tower Terrace EB over I 380

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

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

Tower Terrace EB over I 380 in Linn County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2022, making it 3 years old at the 2025 inventory.
It carries about 885 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 182 of the 511 inventoried bridges in Linn County rated good (35.6%); 34 (6.7%) 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.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 294 ft
Location	2.4 mi. S Jct. SR E34
NBI structure number	000000000605041
Condition class	Good

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