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Bridge conditions in Linn County, Iowa

511 inventoried bridges · 34 rated poor · 2025 National Bridge Inventory

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

Linn County tracks close to typical: 34 of its 511 inventoried bridges (6.7%) are rated poor, against a national rate of about 7%.

34 of the 511 bridges in Linn County, Iowa, are rated in poor condition (6.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
182 bridges (35.6%) are rated good and 295 (57.7%) fair.
The median Linn County bridge was built in 1990.
The busiest poor-rated bridge is 8TH Ave over Indian Creek (built 1988), carrying about 10,789 vehicles a day.

Good 35.6% · Fair 57.7% · Poor 6.7% of 511 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
8TH Ave over Indian Creek	1988	10,789	Poor
Edgewood Rd NE over Cedar River & RR	1969	10,268	Poor
Center Point Rd over over Cc RR	1968	9,703	Poor
8TH Ave over Cedar River	1938	9,382	Poor
Covington Rd over Silver Creek	1955	5,696	Poor
Covington Rd over Lone Tree Creek	1925	5,200	Poor
C St. over Prairie Creek	1964	4,910	Poor
J St over Prairie Creek	1964	4,121	Poor
E Ave Northwest over Cedar River	1979	3,461	Poor
16TH Ave EB over over UP RR & Street	1937	3,200	Poor
N Centerpoint over East Blue Creek	1930	2,583	Poor
F Ave Northwest over Cedar River	1979	2,193	Poor
Troy Mills Rd over Wapsipinicon River	1951	2,033	Poor
Northbrook Dr over Dry Creek	1972	1,755	Poor
3RD Ave SE (EB) over Cedar River	1912	1,610	Poor
18TH St SW over Drainage Ditch	1978	1,494	Poor
Winslow Rd over Indian Creek	2002	1,129	Poor
Central City Rd over East Otter Creek	1962	982	Poor
FM E-66 over Oscar Creek	1917	640	Poor
Alburnett Rd over River Bend Creek	1963	462	Poor
Worchester Rd over Morgan Creek	2000	439	Poor
Rosedale Rd over Indian CR	1890	299	Poor
5TH Ave over Little Big Creek	1915	232	Poor
Matsell Pk Rd over Wapsipinicon River	1939	147	Poor
Cedar Ridge Rd. over Blue Creek	1989	147	Poor
Sutton Rd over Wapsipinicon River	1879	140	Poor
Big Creek Rd. over Big Creek	1929	130	Poor
Martin Cr.rd. over Martins CR	1972	120	Poor
Old Br.rd. over Prairie Creek	1906	110	Poor
Hills Mill Rd over Buffalo Creek	1940	88	Poor
Burlingham Rd over Buffalo CR	1900	50	Poor
Morgan Br Rd over Morgan Creek	1987	34	Poor
Red Bridge Rd over Buffalo CR	1900	15	Poor
Hickoryvalleyrd over West Otter Creek	1987	11	Poor

Busiest bridges in the county

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
NB I 380 over J Ave NE	1980	38,800	Fair
SB I-380 over J Ave NE	1980	38,800	Fair
NB I-380 over Coldstream Ave NE	1980	35,400	Fair
SB I-380 over Coldstream Ave NE	1980	35,400	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Linn County → - all 511, busiest first, each with its own condition record.

All of Iowa: Iowa bridge conditions by county · every download on the data page.

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