Marathon County, WI

534 public highway bridges

Marathon County Bridge Snapshot

Marathon County, Wisconsin contains 534 public highway bridges in the FHWA National Bridge Inventory. Roughly 38% are rated “Good,” 37.3% “Fair,” 10.1% “Poor,” and 10.1% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in WI are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

534

Total Bridges

38%

Good

10.1%

Poor

10.1%

Structurally Deficient

Condition Distribution

Good

38% (203)

Fair

37.3% (199)

Poor

10.1% (54)

SD

10.1% (54)

All Bridges (534)

Sort:

USH 51NB

Over: STH 52

AT USH51, Marathon, WI

Built 2008 ADT: 17,800

USH 51 SB

Over: STH 52

0.8M S JCT STH 52, Marathon, WI

Built 2007 ADT: 17,800

USH 51 NB EXIT RAM

Over: LRD STEWET AVE

AT THE EXIT RAMP N USH51, Marathon, WI

Built 2010 ADT: 8,900

STH 29 EB

Over: LRD 28TH AVENUE

AT STH 29 EB, Marathon, WI

Built 2008 ADT: 13,700

STH 29 WB

Over: LRD 28TH AVENUE

AT STH 29 WB, Marathon, WI

Built 2008 ADT: 13,700

STH 29

Over: LRD SHERMAN ST

AT 29, Marathon, WI

Built 2008 ADT: 7,900

USH 51NB TO29WB

Over: USH51

AT INTERSECTION, Marathon, WI

Built 2008 ADT: 61,100

STH 29EB

Over: LRD RAMP TO STEWART AVEN

WAUSAU, Marathon, WI

Built 2007 ADT: 3,700

STH29EB TO USH 51N

Over: STH 29

AT INTERSECTION, Marathon, WI

Built 2010 ADT: 13,000

USH 51

Over: USH 51

AT X STH29, Marathon, WI

Built 2010 ADT: 56,000

STH 29 WB SYSTEM R

Over: STH 52

1.2M S, Marathon, WI

Built 2008 ADT: 17,800

USH RAMP USH51SB T

Over: USH RAMP STH 52 TO USH S

2.1M, Marathon, WI

Built 2008 ADT: 4,900

USH STH 29WB RAMP

Over: STH STEWART AVE.

AT STH 29WB SYSTEM RAMP, Marathon, WI

Built 2008 ADT: 7,400

STH 29 RAMP

Over: LRD 28TH AVE

AT 29 RAMP, Marathon, WI

Built 2008 ADT: 13,700

LRD BRIDGE ST

Over: USH 51

3.2M N, Marathon, WI

Built 2006 ADT: 38,600

STH 29WB

Over: STH RAMP TO STEWART AVE

WAUSAU, Marathon, WI

Built 2007 ADT: 3,800

STH 29 EB SYSTEM R

Over: LRD STEWART AVE

AT INTERSECTION, Marathon, WI

Built 2010 ADT: 8,900

USH 51 SB ENTRANCE

Over: LRD STEWART AVE

0.2 MI. N. JCT STH 52, Marathon, WI

Built 2007 ADT: 8,900

CTH Y

Over: STH 29

AT CTH Y, Marathon, WI

Built 2005 ADT: 13,000

IH 39 SB/USH 51

Over: USH BUS 51

0.2 MI S JCT IMPERIAL AVE, Marathon, WI

Built 2013 ADT: 14,100

LRD KOWALSKI RD

Over: IH 39

2.8M N STH153, Marathon, WI

Built 2008 ADT: 34,200

CTH O

Over: STH 29

3.33M E JCT STH 107, Marathon, WI

Built 2013 ADT: 20,700

LRD MAPLE RIDGE RD

Over: IH 39

2.0M N JCT STH 153 TO E, Marathon, WI

Built 2012 ADT: 29,800

LRD FOX GLOVE RD

Over: IH 39 NB

AT FOX GLOVE RD, Marathon, WI

Built 2011 ADT: 32,700

PEDESTRIAN BRIDGE

Over: STH 29 EB

BETWEEN CTH X - ALDEERSON, Marathon, WI

Built 2011 ADT: 26,000

CTH U

Over: USH 51 NB

AT CTH U, Marathon, WI

Built 2013 ADT: 32,400

PEDESTRIAN

Over: LRD AT MCLENNAN ST

0.1M N JCT STH 52, Marathon, WI

Built 1975 ADT: 2,000

SOO LINE

Over: LRD MCMILLAN ST

0.1M W JCT STH 13, Marathon, WI

Built 1930 ADT: 1,050

LRD FAIRVIEW RD

Over: ROCKY RUN

0.1M W JCT CTH H, Marathon, WI

Built 1971 Load: 8.1 t ADT: 55

CTH C

Over: W BR LT EAU PLEINE RIVER

0.8M W JCT CTH F, Marathon, WI

Built 1930 Load: 16.2 t ADT: 1,465

CTH J

Over: EAU CLAIRE RIVER

0.3M N JCT STH 29, Marathon, WI

Built 1955 Load: 17.8 t ADT: 1,441

CTH N

Over: BIG SANDY CREEK

0.5M W JCT CTH SS, Marathon, WI

Built 1959 Load: 17.8 t ADT: 4,000

CTH Z

Over: BIG SANDY CREEK

1.2M E JCT CTH J, Marathon, WI

Built 1962 Load: 17.8 t ADT: 1,250

LRD CORLAD RD

Over: RANDALL CREEK

1.6M N JCT STH 29, Marathon, WI

Built 1927 Load: 17.8 t ADT: 113

LRD E MC MILLAN RD

Over: SQUAW CREEK

1.7M W JCT CTH T, Marathon, WI

Built 1958 Load: 17.8 t ADT: 112

CTH M

Over: LITTLE EAU PLEINE RIVER

2.4M S JCT CTH C, Marathon, WI

Built 1961 Load: 19.4 t ADT: 1,720

USH 51 NB

Over: COUNTY LINE CREEK

5.6M N JCT CTH WW TO E, Marathon, WI

Built 1974 Load: 19.4 t ADT: 10,300

LRD SUGAR BUSH RD

Over: FREEMAN CREEK

1.2M E JCT CTH S, Marathon, WI

Built 1986 Load: 19.4 t ADT: 95

LRD W BEAR LAKE RD

Over: SPRING BROOK

1.8M E JCT CTH Y, Marathon, WI

Built 1967 Load: 19.4 t ADT: 50

LRD NEHRBASS RD

Over: BR BLACK CREEK

0.3M S JCT CTH A, Marathon, WI

Built 1946 Load: 19.4 t ADT: 42

LRD ROSEDALE AVE

Over: W BR BIG EAU PLEINE RIVE

1.9M N JCT STH 29, Marathon, WI

Built 1936 Load: 19.4 t ADT: 90

LRD MERIDIAN RD

Over: BLACK CREEK

1.8M N JCT CTH U, Marathon, WI

Built 1940 Load: 19.4 t ADT: 126

LRD CHOKECHERRY RD

Over: DILL CREEK

1.7M E JCT STH 13, Marathon, WI

Built 1955 Load: 19.4 t ADT: 92

LRD CORLAD RD

Over: BLACK CREEK

1.8M S JCT STH 97, Marathon, WI

Built 1982 Load: 21.1 t ADT: 25

LRD CEMETARY RD

Over: PORKY CREEK

0.1M N JCT STH 29, Marathon, WI

Built 1967 Load: 21.1 t ADT: 30

STH 97

Over: LITTLE EAU PLEINE RIVER

0.1M N JCT CTH T, Marathon, WI

Built 1966 Load: 22.7 t ADT: 7,600

CTH C

Over: JOHNSON CREEK

1.1M W JCT CTH X, Marathon, WI

Built 1969 Load: 22.7 t ADT: 493

CTH X

Over: JOHNSON CREEK

1.7M N JCT CTH C, Marathon, WI

Built 1969 Load: 22.7 t ADT: 873

CTH O

Over: LITTLE RIB RIVER

1.9M N JCT CTH U, Marathon, WI

Built 1970 Load: 22.7 t ADT: 1,250

LRD TOWN LINE RD

Over: MARSH CREEK

1.2M S JCT STH 29, Marathon, WI

Built 1941 Load: 22.7 t ADT: 90

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026