Every bridge in Clay County, Iowa

Name: Every bridge in Clay County, Iowa
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

154 inventoried bridges, busiest first

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

Clay County, Iowa, has 154 bridges in the 2025 National Bridge Inventory: 58 rated good, 80 fair, and 16 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
US 18 & 71 over Little Sioux River	2006	16,900	Good
US 71 over Br of Little Meadow Crk	1990	11,400	Fair
US 71 over Prairie Creek	2017	4,770	Good
US 18 over Drainage Ditch	1965	4,270	Fair
US 18 over Lost Island Outlet	1931	4,270	Fair
US 18 over Little Sioux Overflow	1931	4,170	Fair
US 18 over Little Sioux River	2010	4,170	Good
US 71 over Willow Creek	1923	3,940	Fair
US 18 over Ocheydon River Overflow	1987	2,990	Good
US 18 over Ocheyedan River	2014	2,990	Good
FM 240TH Ave over Little Sioux River	1991	2,623	Good
350TH St over Little Sioux River	1976	2,584	Fair
FM 340TH St over Little Sioux River	1963	2,573	Poor
US 18 over Little Sioux River	1930	2,560	Fair
200 Ave over Ocheyedan River	2012	2,273	Good
FM 350TH St over Ocheyedan River	1973	1,806	Fair
FM 350TH St over Spring Creek	1963	1,806	Poor
FM 130TH Ave over Ocheyedan River	1971	1,287	Poor
FM 190TH Ave over Ocheyedan River	2002	1,277	Good
FM 240TH Ave over Drainage Ditch #28	1987	1,228	Fair
FM 320TH St over Dd #28	1996	1,228	Fair
Ia 10 over Little Sioux River	1970	1,030	Fair
FM 310TH Ave over L Trumbull Outlet	1970	968	Fair
FM 350TH St over Drainage	1972	908	Fair
Railway St over Elk Creek	1996	884	Fair
350TH St over Overflow Meadow Creek	1976	878	Fair
FM 350TH St over Big Meadow Creek	1963	878	Fair
N18 340TH Ave over Lost Island Lake	2021	838	Good
FM 190TH Ave over Prairie Creek	1964	818	Fair
FM 400TH St over Willow Creek	1968	797	Fair
Ia 10 over Drainage Ditch	1932	700	Fair
Ia 10 over Drainage Ditch	1976	700	Good
FM 130TH Ave over Willow Creek	1964	619	Fair
FM 100TH Ave over Stream	1972	529	Fair
FM 300TH St over Drainage Ditch	1963	469	Fair
FM 440TH St over Small	1988	469	Fair
FM 280TH Ave over Pickeral Run	1993	459	Poor
M50 240TH Ave over Prairie Creek	2022	447	Good
FM 440TH St over Willow Creek	2009	399	Good
B63 (480TH St) over Montgomery Creek	2014	369	Good
FM 300TH St over Big Muddy Creek	1963	369	Poor
FM 300TH St over Little Meadow Ck	1989	369	Fair
FM 480TH St over Little Sioux River	1954	369	Poor
FM 100TH Ave over Br Ocheyedan R	1967	359	Fair
N18 330TH Ave over Pool-mud Lake	2018	350	Good
B53 5TH St over Little Sioux River	2021	339	Good
FM 280TH St over Little Sioux River	1966	270	Poor
FM 280TH St over Stoney Creek	1965	270	Fair
N14 310TH Ave over Elk Creek	2022	264	Good
FM 310TH Ave over Ditch NO.60	1967	259	Poor
FM 240TH Ave over Little Muddy Creek	1987	240	Good
FM 430TH St over Elk Creek	2004	240	Good
225TH Ave over Prairie Creek	2022	223	Good
FM 170TH Ave over Small Waterway	1993	219	Good
FM 170TH Ave over Willow Creek	1963	219	Fair
FM 160TH Ave over Willow Creek	1962	190	Poor
340TH St over Stony Creek	2003	185	Fair
FM 150TH Ave over Willow Creek	1973	180	Fair
1ST St South over Pickeral Run	2021	171	Good
140TH Ave over Ocheyedan River	1963	153	Fair
230TH Ave over Dd #28	1979	123	Fair
240TH Ave over Little Meadows	1999	123	Fair
330TH St over Stream	1900	123	Fair
FM 280TH Ave over Pickerel Run	1990	120	Fair
Local Rd over Small	2003	112	Good
340TH St over Big Meadow Creek	1981	105	Fair
290TH Ave over Stream	1994	103	Fair
330TH St over Little Meadow Creek	1975	103	Good
340TH St over Little Meadow Creek	1981	103	Good
150TH Ave over Stoney Creek	1994	81	Good
225TH Ave over Small Stream	1978	81	Fair
310TH St over Little Sioux River	1986	81	Good
330TH St over Big Meadow Creek	1990	81	Good
FM 320TH St over Big Meadow Creek	1978	80	Fair
190TH Ave over Willow Creek	1978	72	Fair
250TH Ave over Little Muddy Creek	1996	72	Fair
330TH St over Stream	2005	72	Fair
FM 260TH Ave over Little Sioux River	1969	71	Fair
FM 260TH Ave over Montgomery Creek	1978	71	Fair
FM 260TH Ave over Overflow Little Sioux	1966	71	Fair
150TH Ave over Stream	2000	62	Good
210TH Ave over Little Sioux River	1915	62	Poor
250TH Ave over Prairie Creek	1990	62	Fair
455TH St over Montgomery Creek	2002	62	Fair
280TH St over Stream	2000	60	Fair
Pk 658(WANATA) over Little Sioux River	1972	58	Good
180TH Ave over Willow Creek	1979	50	Fair
390TH St over Prairie Creek	2008	50	Good
FM 190TH Ave over Little Sioux River	1992	50	Good
FM 270TH Ave over Meadow Creek	1968	50	Fair
FM 280TH St over Big Meadow Creek	1977	50	Fair
FM 290TH Ave over Pickeral Run #37	1995	50	Fair
370TH St over Stream	2001	47	Fair
140TH Ave over Stony Creek	1978	46	Good
190TH Ave over Stream	1999	46	Fair
300TH Ave over Stream	1999	46	Fair
340TH St over Pickerel Run	1991	46	Good
420TH St over Stream	2005	46	Good
490TH St over Montgomery Creek	1990	46	Fair
FM 200TH Ave over Willow Creek	1989	45	Fair
105TH Ave over Henry Creek	1965	41	Poor
330TH St over Stony Creek	1965	41	Fair
355TH St over Little Sioux River	1905	41	Poor
370TH St over Stream	1998	41	Good
460TH St over Stream	1994	41	Fair
160TH Ave over Spring Creek	1981	40	Good
390TH St over Overflow Little Sioux R	1955	40	Fair
FM 160TH Ave over Ocheyedan River	1981	40	Fair
FM 390TH St over Little Sioux River	1986	40	Fair
100TH Ave over Willow Creek	1996	35	Good
290TH St over Meadow Creek	2002	35	Good
FM 160TH Ave over Stony Creek	1990	34	Good
FM 320TH St over Drainage Dist #37 Ditch	1978	34	Fair
110TH Ave over Willow Creek	1928	30	Poor
260TH Ave over Big Meadow Creek	2000	30	Good
290TH St over Little Sioux River	1978	30	Fair
310TH St over Meadow Creek	1999	30	Fair
340TH St over Ocheyedan River	2008	30	Good
370TH Ave over Stream	2000	30	Fair
380TH St over Prairie Ck	1977	30	Fair
470TH St over Montgomery Creek	1998	30	Fair
495TH St over Little Sioux River	2005	30	Good
110TH Ave over Henry Creek	1965	26	Fair
225TH St over Willow Creek	1978	26	Fair
270TH Ave over Montgomery Creek	1993	26	Good
270TH St over Stony Creek	1976	26	Fair
300TH St over Stoney Creek	2005	26	Good
310TH St over Stony Creek	2020	26	Good
470TH St over Little Sioux River	1907	26	Poor
180TH Ave over Prairie Creek	2008	21	Fair
300TH St over Ocheydan River	2015	21	Good
310TH St over Little Muddy Creek	1991	21	Fair
320TH Ave over Stream	2007	21	Good
390TH St over Prarie Creek	2006	21	Good
460TH St over Stream	2005	21	Good
270TH St over Big Meadow Ck	1976	20	Fair
FM 320TH Ave over Dd #22	2003	20	Fair
290TH St over Stoney Creek	2004	15	Fair
330TH Ave over D.D#60	2011	15	Fair
345TH St over Stream	2002	15	Good
430TH St over Willow Creek	2020	15	Good
450TH St over Stream	1949	15	Fair
120TH Ave over Willow Creek	2011	11	Good
200TH Ave over Prairie Creek	2003	11	Good
280TH Ave over Elk Creek	1917	11	Poor
300TH Ave over Stream	2000	11	Fair
300TH St over Little Sioux River	1996	11	Good
400TH St over Willow Creek	2011	11	Good
420TH St over Elk Creek	1978	11	Fair
420TH St over Willow Creek	1978	11	Fair
SR M22 over Side Ditch	1959	10	Good
290TH St over Stream	1913	5	Poor
390TH St over Willow Creek	2008	5	Good
400TH St over Stream	2014	5	Good

Source: FHWA National Bridge Inventory, 2025.

Clay County bridge conditions · Iowa bridges by county.

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