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Bridge conditions in Marathon County, Wisconsin

531 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory

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

40 of the 531 bridges the federal inventory lists in Marathon County are rated poor; the rest split 203 good and 288 fair.

40 of the 531 bridges in Marathon County, Wisconsin, are rated in poor condition (7.5%) in the 2025 National Bridge Inventory, as of August 20, 2026.
203 bridges (38.2%) are rated good and 288 (54.2%) fair.
The median Marathon County bridge was built in 1987.
The busiest poor-rated bridge is Lrd Stewart Ave over Wisconsin River 31 (built 1915), carrying about 28,144 vehicles a day.

Good 38.2% · Fair 54.2% · Poor 7.5% of 531 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
Lrd Stewart Ave over Wisconsin River 31	1915	28,144	Poor
Cth U over Little Rib River	1957	1,985	Poor
Cth N over Big Eau Pleine River	1961	1,106	Poor
Cth A over Big Rib River	1956	1,032	Poor
Cth C over Plover River	1954	811	Poor
Cth H over Black Creek	1969	807	Poor
Cth A over W Br Eau Pleine River	1962	783	Poor
Cth T over Mcgivern Creek	1957	767	Poor
Cth H over Rocky Run	1960	668	Poor
Cth F over E Br Big Eau Pleine Rive	1962	665	Poor
Cth M over Big Eau Pleine River	1975	637	Poor
Cth S over Br Big Rib River	1938	634	Poor
Cth Q over E Br Big Sandy Creek	1967	602	Poor
Cth S over Little Eau Pleine River	1964	591	Poor
Cth P over Fenwood Creek	1959	565	Poor
Cth N over Haman Creek	1952	521	Poor
Cth L over Grass Creek	1961	478	Poor
Lrd Columbus St over Plover River	1958	391	Poor
Cth Vv over Little Wolf River	1962	360	Poor
Cth P over Big Eau Pleine River	1958	299	Poor
Cth M over Fenwood Creek	1938	283	Poor
Lrd Aspen Rd over Scotch Creek	1968	271	Poor
Lrd County Line Rd over Big Cain Creek	1965	248	Poor
Lrd Pleasant Rd over E Br Yellow River	1947	133	Poor
Lrd Chesak Rd over Br Scotch Creek	1931	127	Poor
Lrd Mcmillan Rd over Squaw Creek	1956	122	Poor
Lrd Wertzburg Rd over Randall Creek	1975	105	Poor
Lrd 136TH St (dea over Artus Creek	1963	100	Poor
Lrd Mulberry Rd over Winding Creek	1955	98	Poor
Lrd 96TH Ave over Little Rib River	1941	95	Poor
Lrd 60TH Ave over Otto Creek	1955	92	Poor
Lrd Pope Ave over Br W Br Big Eau Pleine R	1930	91	Poor
Lrd Abe Lincoln Av over Carlson Creek	1929	90	Poor
Lrd N Gavin Ave over Little Eau Pleine River	1962	68	Poor
Lrd Naugart Dr over W Fk Lt Rib River	1990	43	Poor
Lrd Huckleberry Rd over Randall Creek	1920	30	Poor
Lrd Butternut Rd over Br Haman Creek	1920	30	Poor
Lrd Thirteen Lane over Br Mcginnis Creek	1977	24	Poor
Lrd River Edge Rd over Big Sandy Creek	1929	23	Poor
Lrd Chesak Rd over Scotch Creek	1962	20	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Ih Ush 51-ih 39 NB over Ush Bus 51 & R.R.	2012	39,600	Fair
Ih 39 Sb/ush 51 over Ush Bus 51	2013	39,600	Good
Ush 51NB over Lrd Stewart Ave	2009	38,600	Good
Ush 51 SB over Lrd Hwy 52 Parkway	2007	38,600	Good
Ih Ush 51-ih 39 SB over Wisconsin River 26	1968	37,700	Good
Ush 51 NB over Lrd Sherman St	2007	34,100	Good
Ush 51SB over Lrd Sherman Ave	2007	34,100	Good
Ush 51 NB over Wis Central Ltd RR	2007	34,100	Good
Ush 51 SB over Wisconsin Central RR	2007	34,100	Good
Ush B51-grand Ave over Wisconsin Central Ltd	1964	31,844	Fair

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

All of Wisconsin: Wisconsin 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.