Every bridge in Lyon County, Iowa

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

273 inventoried bridges, busiest first

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

Lyon County, Iowa, has 273 bridges in the 2025 National Bridge Inventory: 104 rated good, 99 fair, and 70 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
Ia 9 over Stream	1980	4,840	Good
Ia 9 over Bloodrun Creek	1977	4,520	Fair
Ia 9 over Stream	1940	4,520	Fair
US 75 & Ia 9 over Moon Creek	1972	4,400	Fair
Ia 9 over Rock River	1974	3,920	Fair
Ia 9 over Mud Creek	1975	3,270	Fair
Ia 9 over Moon Creek	1974	3,180	Fair
Ia 9 over Stream	1982	3,180	Fair
Ia 9 over over BNSF RR	1982	3,180	Fair
US 75 over Rock River	1975	2,620	Fair
US 75 over Little Rock River	1975	2,610	Fair
Ia 182 over Stream	1955	2,500	Fair
Ia 182 over Stream	1955	2,500	Fair
US 18 over Dry Run Creek	1975	2,240	Fair
US 18 over Big Sioux River	1978	2,130	Fair
US 18 over Drainage Ditch	1975	2,130	Fair
Ia 9 over Little Rock River	1987	1,730	Fair
A18 (140TH St) over Big Sioux River	1963	1,607	Fair
US 75 over Drainage Ditch	1935	1,500	Fair
FM over Lizard Creek	1975	1,416	Fair
W Daktoa Ave over Rio Grande Creek	2011	1,349	Good
A42 240TH St over Albertson Creek	2019	1,176	Good
FM over Johnson Creek	2006	1,168	Good
Virginia St over Little Rock River	1949	1,167	Fair
K42 Garfield Ave over Little Rock River	2011	1,087	Good
A26 (180TH St) over Big Sioux River	1977	1,017	Poor
FM over Klondike Creek	1962	1,017	Poor
210TH St over Mud Creek	2011	998	Fair
FM over Rock River	1966	977	Poor
A50 (bridge St) over Big Sioux River	1971	888	Fair
A50 260TH St over Small Stream	1968	888	Fair
FM over Emery Creek	1977	818	Fair
FM over Argo Slough	1977	789	Fair
FM over Nelson Creek	1966	789	Poor
FM over Burr Oak Creek	1961	758	Fair
FM over Small Stream	1968	729	Fair
A34 210TH St over Little Rock River	2015	718	Good
FM over Overflow	1969	718	Poor
FM over Little Rock River	1954	709	Poor
A34 210TH St over Kelly Creek	2017	698	Good
A42 240TH St over Mud Creek	2003	698	Good
FM over BNSF RR	2003	698	Good
FM over Mud Creek	1968	688	Poor
N Union Street over Moon Creek	2019	670	Good
East St over Tom Creek	2023	660	Good
A52 260TH St over Otter Creek	2020	649	Good
FM over Putnam Creek	1977	649	Fair
A34 210TH Ave over Willow Creek	2017	578	Good
FM over West Rat Creek	2007	578	Good
FM over Mud Creek	1961	509	Poor
FM over Small Stream	1946	509	Fair
L14 over Dry Run Creek	1964	509	Poor
L14 over Tom Creek	1964	509	Poor
L14 over Turner Creek	1964	509	Poor
FM over Dry Run Creek	1964	469	Poor
FM over Mud Creek	1970	450	Poor
FM over Small Stream	1961	450	Fair
K30 Dove Ave over Sykes Creek	2019	450	Good
FM over Blood Run Creek	2000	439	Good
FM over Taft Creek	1955	439	Fair
FM over Lizard Creek	1970	399	Fair
FM over Rat Creek	1971	399	Fair
FM over Rock River	1970	399	Poor
Section Line St over Little Rock River	1951	383	Good
FM over Kanaranzi Creek	1959	369	Poor
FM over Little Rock River	1955	369	Poor
N Boone St over Moon Creek	1958	354	Poor
FM over Blood Run Creek	1971	350	Fair
N 2ND Ave over Small Stream	1900	346	Poor
Local Road over Rock River	1968	337	Poor
Michigan Ave over Rio Grande Creek	1999	326	Good
FM over Klondike Creek	1966	309	Poor
FM over Mud Creek	1970	290	Poor
FM over Riggs Creek	1970	290	Poor
FM over Toole Creek	1970	290	Fair
K60 Indian Ave over Tom Creek	2022	279	Good
FM over Dry Run Creek	1958	270	Fair
FM over Emery Creek	1980	270	Fair
FM over West Rat Creek	1977	259	Fair
W Harris St over Rio Grande Creek	1966	254	Fair
FM over Small Stream	2005	240	Fair
FM over Small Stream	1972	240	Poor
Calumet Ave over Rio Grande Creek	2011	232	Good
Minnesota Ave over Rio Grande Creek	1950	232	Fair
Ohio Ave over Rio Grande Creek	1995	232	Good
Sidney St over Rio Grande Creek	2011	232	Good
W Indiana Ave over Rio Grande Creek	1940	232	Poor
FM over West Rat Creek	1965	230	Poor
K60(INDIAN Ave) over Little Rock River	1960	230	Poor
FM over Plum Creek	1968	210	Poor
Jefferson St over Mclaren Creek	1968	201	Fair
FM over Little Otter Creek	1968	199	Poor
FM over Overflow	1968	199	Poor
FM over Rat Creek	1966	199	Poor
FM over Little Rock River	1973	190	Fair
FM over Small Stream	1975	190	Fair
FM over Blood Run Creek	1971	180	Poor
FM over Rock River	1980	180	Fair
Local over Little Rock River	1982	143	Fair
FM over Little Rock River	1968	131	Poor
Local Road over Mud Creek	1971	112	Fair
Local Road over Trib to Mud Creek	2004	112	Good
Local over Mud Creek	1963	112	Fair
Birch Ave over Klondike Creek	2021	103	Good
Coolidge Ave over Small	1993	100	Good
FM over Albertson Creek	1973	100	Fair
FM over Hess Creek	1967	100	Fair
FM over Kanaranzi Creek	1980	100	Good
FM over Little Rock River	1975	100	Fair
FM over Taft Creek	1967	100	Fair
Cherry Ave over Plum Creek	2018	90	Good
FM over Tom Creek	1972	90	Fair
Local Road over Blood Run Creek	1900	90	Poor
240TH St over Rat Creek	2020	81	Good
Local Road over Gilbertson Creek	1975	81	Fair
Local Road over Little Rock River	1997	81	Good
Local over Small Stream	1990	81	Good
110TH St over Toole Creek	2017	72	Good
230TH St over Mclaren Creek	2014	72	Good
230TH St over Mclaren Creek	2014	72	Good
FM over Small Stream	1978	71	Fair
FM over Spring Creek	1971	71	Fair
FM over Turner Creek	1980	71	Fair
Local Road over Little Rock River	1900	71	Poor
Marsh Ave over Little Otter Creek	2019	71	Good
Able Blvd over Mclaren Creek	2016	62	Fair
Local Road over Kanaranzi Creek	2010	62	Good
Local Road over Little Rock River	1900	62	Poor
Local Road over Lizard Creek	1900	62	Poor
Local Road over Moon Creek	1900	62	Poor
Local Road over Mud Creek	1962	62	Fair
Local Road over Pinney Creek	1900	62	Poor
Local Road over Small	2004	62	Good
Local Road over Small Stream	1900	62	Poor
Local Road over Turner Creek	2006	62	Good
Local over Plum Creek	1979	62	Fair
Local over Rock River	1900	62	Poor
Local over over Flow	2004	62	Good
FM over Hefferman Creek	1978	60	Fair
FM over Small Stream	1978	60	Fair
FM over Tom Creek	1977	60	Fair
FM over Tom Creek	1980	60	Fair
210TH St over Plum Creek	2013	50	Good
260TH St over Albertson Creek	2017	50	Good
Ashley Ave over Peterson Creek	2022	50	Good
Dogwood Ave over Small Stream	2015	50	Good
FM over Kelly Creek	1957	50	Fair
FM over Little Rock River	1950	50	Fair
FM over Rat Creek	2008	50	Fair
FM over Small Stream	1978	50	Fair
Harrison Ave over Burr Oak Creek	2019	50	Good
Ibex Ave over Burr Oak Creek	2019	50	Good
Jackson Ave over Tom Creek	2017	50	Good
K14 Buchanan Ave over Blood Run Creek	2019	50	Good
Local Rd over Mud Creek	1979	50	Fair
Local Road over Johnson Creek	1995	50	Good
Local Road over Klondike Creek	1991	50	Good
Local Road over Rat Creek	1900	50	Fair
Local Road over Small Stream	1994	50	Good
Local Road over Willow Creek	1940	50	Poor
Local Road over Mud Creek	1900	49	Fair
220TH St over Emery Creek	2017	46	Good
220TH St over Plum Creek	2021	46	Good
Fig Ave over Lizard Creek	2014	46	Good
Ibex Ave over Emery Creek	2017	46	Good
Ibex Ave over Little Rock River	1978	46	Fair
Jefferson Ave over Small Stream	2014	46	Good
Local Road over Argo Slough	1900	46	Poor
Local Road over Hefferman Creek	1900	46	Poor
Local Road over Mud Creek	1900	46	Poor
Local Road over Trib to Mud Creek	2004	46	Good
Local Road over Zoar Creek	1992	46	Good
Local over Stream	1981	46	Fair
200TH St over Taft Creek	2014	45	Good
FM over Allen Creek	1978	45	Fair
FM over Argo Slough	1980	45	Fair
FM over Emery Creek	1970	45	Fair
FM over Small Stream	1977	45	Good
FM over Toole Creek	1979	45	Fair
160TH St over Burns Creek	2017	41	Good
K14 Beech Ave over Plum Creek	1977	41	Fair
Local Road over Albertson Creek	1900	41	Poor
Local Road over Albertson Creek	2008	41	Fair
Local Road over Klondike Creek	1900	41	Poor
Local Road over Klondike Creek	1900	41	Poor
Local Road over Small Stream	1900	41	Poor
Local over Plum Creek	1979	41	Fair
Local over Stream	1981	41	Fair
Log Ave over Hess Creek	2015	41	Good
Log Avenue over West Rat Creek	2020	41	Good
FM over Emery Creek	1978	40	Good
FM over Johnson Creek	1980	40	Good
Buchanan Ave over Mclaren Creek	1992	35	Good
Kennedy Ave over Dry Run Creek	2005	35	Good
Local Rd over Argo Slough	2003	35	Good
Local Road over Creek	1989	35	Good
Local Road over Emery Creek	1900	35	Poor
Local Road over Otter Creek	2010	35	Fair
Local Road over Small Stream Overflow	1970	35	Fair
Local over Small	1989	35	Good
Local Road over Little Rock River	1970	34	Fair
Log Ave over West Rat Creek	1900	34	Fair
Log Ave over West Rat Creek	2020	34	Good
140TH St over Tom Creek	2017	33	Good
140TH St over Creek	1989	30	Good
200TH St over Johnson Creek	2014	30	Good
220TH St over West Rat Creek	2014	30	Good
250TH St over Allen Creek	2017	30	Good
255TH St over Small Stream	2022	30	Good
Cherry Ave over Small Stream	2015	30	Good
Dogwood Ave over Overflow	2019	30	Good
FM over Small Stream	1990	30	Good
Jay Ave over Tom Creek	2015	30	Good
Larch Ave over Overflow Otter Creek	2022	30	Good
Local Road over Emery Creek	1994	30	Good
Local Road over Johnson Creek	2005	30	Good
Local Road over Mud Creek	1971	30	Fair
Local Road over Otter Creek	1900	30	Poor
Local Road over Spring Creek	1971	30	Fair
Local Road over Spring Creek	1981	30	Fair
Local Road over Taft Creek	1900	30	Poor
Local Road over over Flow	1900	30	Poor
200TH St over Hess Creek	2015	26	Good
Buchanan Ave over Klondike Creek	2019	26	Good
Buchanan Ave over Klondike Creek	2019	26	Good
Buchanan Ave over Klondike Creek	2019	26	Good
Buchanan Ave over Klondike Creek	2018	26	Good
Dogwood Ave over Small Stream	2015	26	Good
Local Road over Allen Creek	1900	26	Poor
Local Road over Argo Slough	1900	26	Poor
Local Road over Creek	1990	26	Good
Local Road over Emery Creek	1900	26	Poor
Local Road over Little Otter Creek	1900	26	Poor
Local Road over Little Rock River	1999	26	Good
Local Road over Mud Creek	1971	26	Fair
Local Road over Overflow	1900	26	Poor
Local Road over Overflow	1900	26	Fair
Local Road over Rat Creek	1954	26	Poor
Local Road over Small Stream	1900	26	Poor
Local Road over Small Stream	1989	26	Good
Local Road over Taft Creek	1992	26	Good
Local Road over Taft Creek	1900	26	Poor
Local Road over Tom Creek	2011	26	Fair
Local Road over Trib to Mud Creek	2004	26	Good
Local Road over Willow Creek	1900	26	Poor
Local over Little Rock River	1987	26	Fair
Local over Small Stream	1991	26	Good
Local over Small Stream	1991	26	Good
Ashley Ave over Blood Run Creek	2018	21	Good
Larch Ave over Tom Creek	2017	21	Good
Local Road over Albertson Creek	1900	21	Fair
Local Road over Blood Run Creek	2000	21	Good
Local Road over Creek	2003	21	Fair
Local Road over Overflow	1900	21	Poor
Local Road over Rat Creek	1900	21	Poor
Local Road over Small Stream	1900	21	Poor
Local over Allen Creek	1989	21	Good
140TH St over Dry Run Creek	2005	20	Good
200TH St over Emery Creek	2017	20	Good
Jay Ave over Stream	2013	15	Good
Local Road over Emery Creek	1900	15	Poor
Local Road over Peterson Creek	1991	15	Fair
Local Road over Small Stream	1900	15	Fair
Local Road over Tom Creek	1969	15	Fair
Local Road over Tom Creek	1900	15	Poor
Local Road over Tom Creek	1974	15	Poor
170TH St over Argo Slough	2017	11	Fair
210TH St over Plum Creek	2018	11	Good
210TH St over Plum Creek	2018	11	Good
Local Road over Hefferman Creek	1900	11	Poor
Local Road over West Rat Creek	1993	11	Fair
Side Ditch Ent over Side Ditch	1900	10	Poor
Local Road over Johnson Creek	1900	5	Poor

Source: FHWA National Bridge Inventory, 2025.

Lyon County bridge conditions · Iowa bridges by county.

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