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:

STH 29 WB

Over: USH 51 BUS

2.9M N JCT USH 51, Marathon, WI

Built 1971 ADT: 18,400

LRD VOLKMAN STREET

Over: STH 29

0.5M E JCT USH 51 BUS, Marathon, WI

Built 1989 ADT: 28,400

LRD ALDERSON ST

Over: STH 29

1.5M E JCT USH 51 BUS, Marathon, WI

Built 1989 ADT: 28,400

STH 153-MAIN ST

Over: LRD DEPOT ST

0.4M N JCT STH 153, Marathon, WI

Built 1963 ADT: 20

LRD SUNRISE LN

Over: STH 29

1.1M E JCT USH 51 TO S, Marathon, WI

Built 1972 ADT: 42,300

STH 107

Over: STH 29

3.0M E JCT CTH S, Marathon, WI

Built 1992 ADT: 16,800

STH 29 EB

Over: LRD 72ND AVE

2.7M S JCT CTH U, Marathon, WI

Built 1971 ADT: 7,400

STH 29 EB

Over: LRD 48TH AVE

1.8M W JCT STH 52, Marathon, WI

Built 1971 ADT: 1,000

STH 29 WB

Over: LRD 48TH AVE

1.8M W JCT STH 52, Marathon, WI

Built 1971 ADT: 1,000

STH 29 WB

Over: LRD 72ND AVE

2.7M S JCT CTH U, Marathon, WI

Built 1971 ADT: 8,700

STH 29 EB

Over: USH 51 BUS

2.9M N JCT USH 51, Marathon, WI

Built 1971 ADT: 18,400

CTH C

Over: IH USH 51-IH 39

3.1M N JCT CTH DB TO E, Marathon, WI

Built 1972 ADT: 22,697

STH 34

Over: IH USH 51-IH 39

4.5M N JCT CTH DB TO E, Marathon, WI

Built 1972 ADT: 29,500

LRD LOCKER RD

Over: IH USH 51-IH 39

1.1M N JCT STH 34 TO S, Marathon, WI

Built 1972 ADT: 29,500

IH USH 51-IH 39 SB

Over: STH 153

1.4M E JCT CTH B, Marathon, WI

Built 1973 ADT: 10,300

IH USH 51-IH 39 NB

Over: STH 153

1.4M E JCT CTH B, Marathon, WI

Built 1972 ADT: 10,300

USH 51 NB

Over: USH B51 SB

0.4M S JCT USH 51, Marathon, WI

Built 1975 ADT: 10,500

USH 51 SB

Over: USH B51 SB & EBCTH K

0.4M S JCT USH 51, Marathon, WI

Built 1975 ADT: 10,500

USH 51 NB

Over: LRD DECATOR DR

0.5M W JCT CTH K, Marathon, WI

Built 1975 ADT: 380

USH 51 SB

Over: LRD DECATOR DR

0.5M W JCT CTH K, Marathon, WI

Built 1975 ADT: 2,100

LRD FALCON DR

Over: USH 51

4.3M N JCT STH 29 TO W, Marathon, WI

Built 1974 ADT: 20,900

USH 51 NB

Over: CTH WW

1.1M W JCT CTH K, Marathon, WI

Built 1974 ADT: 2,000

USH 51 SB

Over: CTH WW

1.1M W JCT CTH K, Marathon, WI

Built 1974 ADT: 2,000

USH 51 NB

Over: LRD MAINE DR

2.9M W JCT CTH K, Marathon, WI

Built 1974 ADT: 100

USH 51 SB

Over: LRD MAINE DR

2.9M W JCT CTH K, Marathon, WI

Built 1974 ADT: 100

USH 51 NB

Over: LRD RAINBOW DR

2.9M W JCT CTH K, Marathon, WI

Built 1974 ADT: 250

USH 51 SB

Over: LRD RAINBOW DR

2.9M W JCT CTH K, Marathon, WI

Built 1974 ADT: 250

WCL RR

Over: USH B51-GRAND AVE

0.1M N JCT STH 29 TO E, Marathon, WI

Built 1978 ADT: 16,800

CTH X

Over: STH 29

2.5M E JCT USH 51 BUS, Marathon, WI

Built 1989 ADT: 15,800

LRD RYAN ST

Over: STH 29

4.0M E JCT USH 51 BUS, Marathon, WI

Built 1989 ADT: 15,800

STH 29 EB

Over: CTH J

0.8M S JCT CTH JJ, Marathon, WI

Built 1990 ADT: 4,700

STH 29 WB

Over: CTH J

0.8M S JCT CTH JJ, Marathon, WI

Built 1990 ADT: 4,750

STH 29 EB

Over: CTH Q

0.4M S JCT CTH JJ, Marathon, WI

Built 1990 ADT: 980

STH 29 WB

Over: CTH Q

0.3M S JCT CTH JJ, Marathon, WI

Built 1990 ADT: 980

LRD MAPLE ROAD

Over: STH 29 EB & WB

0.9M E JCT STH 13, Marathon, WI

Built 1998 ADT: 9,200

STH 97

Over: STH 29 EB

3.0 M E JCT CTH E, Marathon, WI

Built 1999 ADT: 17,300

CTH H

Over: STH 29

5.7M E JCT STH 97, Marathon, WI

Built 1997 ADT: 17,300

STH 29 EB

Over: STH 13

1.5M N JCT CTH N, Marathon, WI

Built 1998 ADT: 10,700

STH 29 WB

Over: STH 13

1.6M N JCT CTH N, Marathon, WI

Built 1998 ADT: 10,700

USH SB USH 51 ON R

Over: USH 51 NB

AT 29, Marathon, WI

Built 2006 ADT: 31,400

STH EB STH29

Over: STH 29

AT INTERSECTION, Marathon, WI

Built 2006 ADT: 4,500

STH 29 EB

Over: USH 51

AT STH29, Marathon, WI

Built 2006 ADT: 62,800

USH 51NB/STH 29

Over: CTH N

AT USH51, Marathon, WI

Built 2005 ADT: 19,100

USH 51SB/STH 29

Over: CTH N

AT USH51, Marathon, WI

Built 2005 ADT: 20,000

LRD ROBIN LANE

Over: IH39/USH51

0.4 MI. N JCT CTH N, Marathon, WI

Built 2005 ADT: 61,100

CTH NN

Over: USH 51 NB-STH29

0.3 MI N. CTH N, Marathon, WI

Built 2006 ADT: 30,550

USH 51 NB

Over: LRD SHERMAN ST

AT USH51, Marathon, WI

Built 2007 ADT: 10,000

USH 51SB

Over: LRD SHERMAN AVE

AT USH51, Marathon, WI

Built 2007 ADT: 10,000

USH 51NB

Over: LRD STEWART AVE

AT USH51NB, Marathon, WI

Built 2009 ADT: 8,900

USH 51 SB

Over: LRD STEWART AVE

AT 51SB, Marathon, WI

Built 2007 ADT: 8,900

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