Marathon County Bridge Report Card

Marathon County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D63 / 100

Local infrastructure snapshot

Marathon County, Wisconsin

Marathon County has 531 bridges in the National Bridge Inventory, with 40 rated poor and 61 rated scour-critical. Its poor-condition share of 7.5% is above the 6.7% statewide average. Poor-condition bridges carry about 43,939 daily vehicle crossings.

531Total Bridges

40Poor (7.5%)

288Fair (54.2%)

61Scour-Critical

Quote-Ready Local Facts

7.5%of county bridges are in poor condition, compared with 6.7% statewide and 6.7% nationally.

43,939daily vehicle crossings are on poor-condition bridges in the county.

61bridges are rated scour-critical, or 11.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Marathon County a Bridge Condition Exposure Score of 63/100 (D). The county has 531 bridges in the National Bridge Inventory, including 40 in poor condition and 61 rated scour-critical. Poor-condition bridges carry about 43,939 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	7.5%	15.1
Poor-condition traffic exposure	25	2.0% of measured traffic	1.5
Scour-critical bridge share	20	11.5%	20.0
Average age vs national baseline	10	42 years vs 48 nationally	0.0
Traffic-data completeness	5	2,200,752 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	7.5%
State Poor-Condition Share	6.7%
National Poor-Condition Share	6.7%
County Scour-Critical Share	11.5%
Average Bridge Age	42 years
Poor-Condition Traffic Exposure	43,939 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeLrd Stewart AVE over Wisconsin River 31 — 28,144 vehicles/day Oldest Listed BridgeLrd Holstein La over Rocky Run — built in 1904 All County BridgesBrowse every bridge record in Marathon County.

Top Bridges to Watch in Marathon County

Bridge	Reason	Condition	Daily Traffic	Year Built
Lrd Stewart AVE over Wisconsin River 31	Poor condition + traffic exposure	Poor	28,144	1915
Cth S over Br Big Rib River	Poor condition + traffic exposure	Poor	634	1938
Cth Q over E Br Big Sandy Creek	Poor condition + traffic exposure	Poor	602	1967
Lrd County Line RD over Big Cain Creek	Poor condition + traffic exposure	Poor	248	1965
Lrd Chesak RD over Br Scotch Creek	Poor condition + traffic exposure	Poor	127	1931
Lrd Mcmillan RD over Squaw Creek	Poor condition + traffic exposure	Poor	122	1956
Lrd 136th ST (dea over Artus Creek	Poor condition + traffic exposure	Poor	100	1963
Lrd Mulberry RD over Winding Creek	Poor condition + traffic exposure	Poor	98	1955
Lrd Pope AVE over Br W Br Big Eau Pleine R	Poor condition + traffic exposure	Poor	91	1930
Lrd Abe Lincoln Av over Carlson Creek	Poor condition + traffic exposure	Poor	90	1929

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.