County profile · official public datasets

Grant County, WI

383 public highway bridges tracked in the FHWA National Bridge Inventory: 66.1% rated Good, 29.5% Fair, 4.4% Poor.

383
Public bridges
66.1%
Good condition
4.4%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Grant County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 32%
lowest Poor share in state
4.4%
Poor-condition share
383
public highway bridges
1984
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Grant County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grant County ranks #23 of 72 Wisconsin counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.4%). Grant County, Wisconsin contains 383 public highway bridges. Roughly 66.1% are rated “Good,” 29.5% “Fair,” and 4.4% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

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

Total bridges

383

Public highway bridges in Grant County

Good condition

66.1%

253 of 383 rated 7-9

Fair condition

29.5%

113 of 383 rated 5-6

Poor condition

4.4%

17 of 383 rated 4 or below

In-state Poor-share rank

#23 of 72

Among Wisconsin counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 383 NBI-tracked bridges by lowest applicable component rating.

Good
66.1% (253)
Fair
29.5% (113)
Poor
4.4% (17)

Grant County's Poor-condition bridges carry 5,024 vehicle crossings a day

That is 1.4% of the county's reported daily bridge traffic on 4.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 296 crossings a day against 871 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 383 of 383 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

28.5% of Grant County's bridges have passed the 50-year mark

109 of the 383 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 66.1% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 23.9% of the county's Poor-condition bridge traffic

CTH T over WISCONSIN RIVER 03, built 1958, carries 1,200 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 17-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 5,024 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Grant County's bridges were built

383 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 75 of the county's bridges still in the inventory were built, which is 19.6% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1984) matches the Wisconsin average (1984).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Grant County compares with Wisconsin's closest counties by inventory size

The 5 Wisconsin counties nearest Grant County in number of bridges, with their condition splits. Its 4.4% Poor share is the 2nd-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1982 is in line with the group.

Showing the 5 closest of 71 Wisconsin counties eligible for comparison.

Bridge inventory size and condition shares for Grant County and the 5 Wisconsin counties closest to it in inventory size
County Bridges Poor
Grant County (this page) 383 4.4%
Monroe County 374 3.5%
Waukesha County 369 6.5%
Chippewa County 359 9.2%
Vernon County 333 7.5%
Barron County 319 5.6%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Grant County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Grant County, both outside Wisconsin so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside WI (383 bridges here).

Similar average build year

Nearest mean year-built outside WI (1984 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 383 Good 253 Fair 113 Poor 17

Good-condition bridges (253)

LRD ROSENDALE RD

Good

Over: TRIB OF BIG GREEN RIVER

0.7M E JCT CTH K, Grant, WI

Built 1998 Load: 37.3 t ADT: 102

LRD FREMONT ST & C

Good

Over: SAUNDERS CREEK

0.5M E JCT USH 61, Grant, WI

Built 2000 Load: 37.3 t ADT: 1,300

USH 151 NB

Good

Over: MCADAM BR

1.9M N JCT CTH HH, Grant, WI

Built 2006 Load: 37.3 t ADT: 8,100

USH 151 SB

Good

Over: MCADAM BR

5.2M S JCT CTH O, Grant, WI

Built 2006 Load: 37.3 t ADT: 8,100

LRD HOMER RD

Good

Over: COON VALLEY CREEK

2.7M N JCT CTH Q, Grant, WI

Built 2001 Load: 37.3 t ADT: 107

LRD LEVEL VALLEY R

Good

Over: GUNDERSON VALLEY CREEK

2.2M W JCT CTH Q, Grant, WI

Built 2000 Load: 37.3 t ADT: 107

CTH J

Good

Over: LITTLE GRANT RIVER

1.3M S JCT CTH JJ, Grant, WI

Built 2003 Load: 37.3 t ADT: 450

LRD BOICE CREEK RD

Good

Over: BR BOICE CREEK

0.2M S JCT CAMELBACK RD, Grant, WI

Built 2001 Load: 37.3 t ADT: 78

LRD PEDDLE HOLLOW

Good

Over: SINNIPEE CREEK

0.7M W JCT USH 61, Grant, WI

Built 2005 Load: 37.3 t ADT: 105

LRD AIRPORT RD

Good

Over: BLOCKHOUSE BRANCH

0.4M E JCT USH 151, Grant, WI

Built 2005 Load: 37.3 t ADT: 105

LRD VAVRICKA RD

Good

Over: BRONSON CR

1.3M E JCT CTH I, Grant, WI

Built 2005 Load: 37.3 t ADT: 102

LRD CHURCH RD

Good

Over: FENNIMORE CREEK

0.1M E JCT CTH Q, Grant, WI

Built 2007 Load: 37.3 t ADT: 115

LRD ROGERS RD

Good

Over: ROGERS BRANCH

2.0M W JCT USH 61, Grant, WI

Built 2005 Load: 37.3 t ADT: 156

LRD STUMPTOWN RD

Good

Over: LITTLE PLATTE RIVER

2.9M S JCT CTH B, Grant, WI

Built 2005 Load: 37.3 t ADT: 220

LRD OAK ROAD

Good

Over: PLATTE RIVER TRIB

AT PLATTE RIVER TRIB, Grant, WI

Built 2005 Load: 37.3 t ADT: 107

CTH A

Good

Over: GRANT RIVER

3.6M W JCT USH 61, Grant, WI

Built 2006 Load: 37.3 t ADT: 501

CTH K

Good

Over: BR BIG GREEN RIVER

2.4M N JCT USH 18, Grant, WI

Built 2012 Load: 37.3 t ADT: 416

LRD WOODLAND LANE

Good

Over: MENOMINEE RIVER

0.3 MI E JCT USH 151, Grant, WI

Built 2023 Load: 37.3 t ADT: 50

LRD BLUE SCHOOL RD

Good

Over: FENNIMORE CREEK

0.1M E JCT CTH Q, Grant, WI

Built 1972 Load: 37.3 t ADT: 53

LRD JOHNSON RD

Good

Over: DRY RUN

0.3 MI EAST OF CTH S, Grant, WI

Built 2014 Load: 38.2 t ADT: 100

LRD IDEAL RD

Good

Over: GUNDERSON VALLEY CREEK

0.6 MI N JCT GOLR RD, Grant, WI

Built 2017 Load: 38.2 t ADT: 100

CTH A

Good

Over: BR BLAKE FORK

1.7M E JCT STH 35, Grant, WI

Built 2010 Load: 38.6 t ADT: 288

CTH A

Good

Over: BR BLAKE FORK

0.9M S JCT CTH J, Grant, WI

Built 2010 Load: 38.6 t ADT: 288

CTH Q

Good

Over: FENNIMORE CREEK

3.8M W JCT CTH G, Grant, WI

Built 2022 Load: 38.6 t ADT: 820

LRD SANDY HOOK RD

Good

Over: MENOMINEE CREEK

0.4M E JCT USH 61, Grant, WI

Built 1989 Load: 38.9 t ADT: 451

STH 133

Good

Over: GRANT RIVER

3.8M N JCT CTH U, Grant, WI

Built 1997 Load: 38.9 t ADT: 810

LRD WITEK RD

Good

Over: FENNIMORE CREEK

3.0M E JCT CTH T, Grant, WI

Built 1991 Load: 38.9 t ADT: 102

STH 133-AMELIA ST

Good

Over: FURNACE CREEK

0.5M N JCT STH 81, Grant, WI

Built 1993 Load: 38.9 t ADT: 1,200

CTH K

Good

Over: GRANT RIVER

2.2M W JCT USH 61, Grant, WI

Built 1993 Load: 38.9 t ADT: 1,166

LRD BADGER RD

Good

Over: MARTIN BRANCH

3.1M W JCT CTH K, Grant, WI

Built 1994 Load: 38.9 t ADT: 102

LRD REYNOLDS RIDGE

Good

Over: BR BOICE CREEK

0.1M W JCT CTH U, Grant, WI

Built 1992 Load: 38.9 t ADT: 78

CTH M

Good

Over: FENNIMORE CREEK

0.3M W JCT CTH Q, Grant, WI

Built 1995 Load: 38.9 t ADT: 180

LRD CROW VALLEY RD

Good

Over: BR FENIMORE CREEK

0.1M S JCT CTH Q, Grant, WI

Built 1996 Load: 38.9 t ADT: 102

LRD CHURCH RD

Good

Over: BR PLATTE RIVER

0.5M E JCT USH 61, Grant, WI

Built 1996 Load: 38.9 t ADT: 53

CTH E

Good

Over: PLATTE RIVER

2.2M W JCT CTH D, Grant, WI

Built 1998 Load: 38.9 t ADT: 614

CTH D

Good

Over: BLOCKHOUSE BRANCH

1.9M S JCT USH 151, Grant, WI

Built 1998 Load: 38.9 t ADT: 1,085

LRD SLEEPY HOLLOW

Good

Over: PLATTE RIVER

0.8M S JCT CTH E, Grant, WI

Built 2001 Load: 38.9 t ADT: 107

LRD UNIVERSITY FAR

Good

Over: BR BLAKE FORK

3.7M E JCT STH 35, Grant, WI

Built 2000 Load: 38.9 t ADT: 102

USH 61 NB/ STH 35

Good

Over: USH 151

2.1M N JCT CTH H, Grant, WI

Built 2005 Load: 38.9 t ADT: 1,700

STH 80

Good

Over: USH 151

0.1M N JCT COLLEGE FARM R, Grant, WI

Built 2003 Load: 38.9 t ADT: 5,900

LRD EVERGREEN RD

Good

Over: USH 151

0.6 MI E JCT EASTSIDE RD, Grant, WI

Built 2004 Load: 38.9 t ADT: 2,100

USH 151 NB

Good

Over: BUSINESS USH 151

2.0M N JCT STH 80, Grant, WI

Built 2004 Load: 38.9 t ADT: 5,000

USH 151 SB

Good

Over: BUSINESS USH 151

1.2M S JCT W MOUND RD, Grant, WI

Built 2004 Load: 38.9 t ADT: 5,000

LRD OLD USH 61

Good

Over: CROOKED CREEK

0.1M E JCT USH 61, Grant, WI

Built 2003 Load: 38.9 t ADT: 102

LRD RED DOG RD

Good

Over: PLATTE RIVER

1.1M N JCT CTH B, Grant, WI

Built 2003 Load: 38.9 t ADT: 103

CTH C (FRIAR BR.)

Good

Over: LITTLE GREEN RIVER

0.2M W JCT STH 133, Grant, WI

Built 2003 Load: 38.9 t ADT: 212

LRD GRANDVIEW RD

Good

Over: NEWELL CREEK

2.9 M E. JCT CTH E, Grant, WI

Built 2005 Load: 38.9 t ADT: 170

LRD BADGER RD

Good

Over: BR MARTIN BRANCH

1.5M W JCT CTH K, Grant, WI

Built 2005 Load: 38.9 t ADT: 158

LRD SANDY HOLLOW R

Good

Over: SANDY CREEK

2.2M S JCT CTH P, Grant, WI

Built 2005 Load: 38.9 t ADT: 102

LRD IDEAL RD

Good

Over: TRIB. TO FENNIMORE BR.

0.9M N OF JCT WOOD RD., Grant, WI

Built 2004 Load: 38.9 t ADT: 105

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

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.