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

Fair-condition bridges (113)

LRD FAIRPLAY RD (D

Fair

Over: FAIRPLAY CREEK

0.3M S JCT STH 11, Grant, WI

Built 1930 Load: 3.2 t ADT: 40

LRD QUARRY RD.

Fair

Over: BLAKELY BRANCH

1.1M S JCT CTH B, Grant, WI

Built 1950 Load: 9.7 t ADT: 53

LRD GOVIER RD

Fair

Over: MARTIN BRANCH

2.2M N JCT CTH A, Grant, WI

Built 1971 Load: 11.3 t ADT: 102

LRD SHADY DELL RD

Fair

Over: MARTIN BRANCH

1.8M S JCT USH 18, Grant, WI

Built 1935 Load: 11.3 t ADT: 102

LRD INDIAN CREEK R

Fair

Over: INDIAN CREEK

2.2M W JCT USH 61, Grant, WI

Built 1935 Load: 11.3 t ADT: 88

CTH U

Fair

Over: BOICE CREEK

4.7M W JCT STH 61, Grant, WI

Built 1977 Load: 14.6 t ADT: 678

LRD GREEN RIVER RD

Fair

Over: BR BIG GREEN RIVER

0.1M E JCT CTH K, Grant, WI

Built 1950 Load: 14.6 t ADT: 104

LRD WATERFALL RD

Fair

Over: LITTLE PLATTE RIVER

2.3M E JCT CTH D, Grant, WI

Built 1927 Load: 14.6 t ADT: 80

LRD BLUFF RD

Fair

Over: SINNIPEE CREEK

1.9M W JCT USH 61, Grant, WI

Built 1949 Load: 16.2 t ADT: 107

LRD W BLUFF ST

Fair

Over: FURNACE BRANCH

0.1M E JCT STH 133, Grant, WI

Built 1965 Load: 16.2 t ADT: 940

CTH A

Fair

Over: LITTLE PLATTE RIVER

0.1M E JCT STH 80, Grant, WI

Built 1950 Load: 17.8 t ADT: 630

STH 133

Fair

Over: HEILER CREEK

7.5M N JCT CTH VV, Grant, WI

Built 1951 Load: 17.8 t ADT: 870

CTH U

Fair

Over: BEETOWN BRANCH

1.4M S JCT STH 81, Grant, WI

Built 1951 Load: 17.8 t ADT: 810

LRD COON HOLLOW RD

Fair

Over: PLATTE RIVER

4.2M N JCT CTH A, Grant, WI

Built 1970 Load: 17.8 t ADT: 53

LRD TEXAS RD

Fair

Over: KUENSTER CREEK

1.0M N JCT STH 133, Grant, WI

Built 1925 Load: 19.4 t ADT: 102

LRD BLUFF ST

Fair

Over: BR MISSISSIPPI RIVER

0.1M W JCT STH 81, Grant, WI

Built 1962 Load: 19.4 t ADT: 940

USH 61

Fair

Over: CROOKED CREEK

3.4M N JCT CTH T, Grant, WI

Built 1952 Load: 21.1 t ADT: 4,000

CTH X

Fair

Over: READY HOLLOW CREEK

1.8M N JCT CTH P, Grant, WI

Built 1958 Load: 21.1 t ADT: 230

LRD PINE GROVE RD

Fair

Over: GREGORY BRANCH

0.1M E JCT USH 61, Grant, WI

Built 1939 Load: 21.1 t ADT: 53

LRD MUSKELLUNGE RD

Fair

Over: RATTLESNAKE CREEK

1.4M E JCT STH 133, Grant, WI

Built 1969 Load: 21.1 t ADT: 102

CTH B

Fair

Over: LITTLE PLATE RIVER

2.8M W JCT STH 81, Grant, WI

Built 1952 Load: 22.7 t ADT: 1,325

LRD SINSINIWA RD

Fair

Over: SINSINIWA RIVER

2.4M W JCT STH 80, Grant, WI

Built 1961 Load: 22.7 t ADT: 91

CTH N

Fair

Over: PIGEON RIVER

2.7M S JCT STH 35, Grant, WI

Built 1962 Load: 22.7 t ADT: 477

LRD EBENEZER RD

Fair

Over: BR PLATTE RIVER

2.6M S JCT USH 18, Grant, WI

Built 1930 Load: 22.7 t ADT: 102

STH 11

Fair

Over: LITTLE MENOMINEE CREEK

4.5M E JCT USH 61, Grant, WI

Built 1939 Load: 24.3 t ADT: 4,300

CTH U

Fair

Over: BEETOWN BRANCH

0.5M N JCT STH 81, Grant, WI

Built 1958 Load: 24.3 t ADT: 740

LRD KUSSMAUL RD

Fair

Over: BR WARNER CREEK

0.1M S JCT CTH C, Grant, WI

Built 1977 Load: 24.3 t ADT: 102

LRD HORSTMAN LANE

Fair

Over: DRY HOLLOW CREEK

2.3M E JCT CTH A 400 N J, Grant, WI

Built 1920 Load: 24.3 t ADT: 51

LRD PATCH GROVE RD

Fair

Over: BLAKE FORK

1.8M E JCT STH 35, Grant, WI

Built 1974 Load: 24.3 t ADT: 102

LRD HILLDALE RD

Fair

Over: BR MARTIN BRANCH

2.1M W JCT CTH K, Grant, WI

Built 1977 Load: 24.3 t ADT: 53

LRD HYPOINT RD

Fair

Over: BR PLATTE RIVER

2.6M N JCT CTH A, Grant, WI

Built 1972 Load: 24.3 t ADT: 80

LRD LIBERY RIDGE R

Fair

Over: BR PLATTE RIVER

1.4M E JCT USH 61, Grant, WI

Built 1973 Load: 24.3 t ADT: 53

LRD ANNATON RD

Fair

Over: PLATTE RIVER

0.5M N JCT CTH E, Grant, WI

Built 1949 Load: 24.3 t ADT: 107

LRD PINE KNOB LANE

Fair

Over: CROW BRANCH

0.5M S JCT CTH E, Grant, WI

Built 1977 Load: 24.3 t ADT: 50

LRD GREENWOOD DR

Fair

Over: BR LITTLE PLATTE RIVER

1.6M S JCT CTH A, Grant, WI

Built 1976 Load: 24.3 t ADT: 53

LRD MUSKELLUNGE RD

Fair

Over: BR RATTLESNAKE CREEK

2.9M W JCT CTH U, Grant, WI

Built 1960 Load: 24.3 t ADT: 80

LRD ATKINSON RD

Fair

Over: RATTLESNAKE CREEK

2.2M E JCT STH 133, Grant, WI

Built 1960 Load: 24.3 t ADT: 102

LRD PRIDE RD

Fair

Over: KUENSTER CREEK

2.2M S JCT CTH V, Grant, WI

Built 1963 Load: 24.3 t ADT: 102

LRD IRISH RIDGE RD

Fair

Over: MCCARTNEY BRANCH

0.3M N JCT CTH N, Grant, WI

Built 1970 Load: 24.3 t ADT: 88

LRD PLEASANT VALLE

Fair

Over: BLOCKHOUSE CREEK

1.8M S JCT STH 80, Grant, WI

Built 1970 Load: 24.3 t ADT: 53

LRD ROCK RD

Fair

Over: SNOWDEN BRANCH

2.1M W JCT CTH D, Grant, WI

Built 1972 Load: 24.3 t ADT: 53

LRD KLAR RD

Fair

Over: FRENCH CREEK

1.3M W JCT CTH D, Grant, WI

Built 1970 Load: 24.3 t ADT: 53

LRD QUARRY RD

Fair

Over: MCADAM BRANCH

0.9M N JCT CTH H, Grant, WI

Built 1950 Load: 24.3 t ADT: 53

LRD PEDDLE HOLLOW

Fair

Over: SINNIPEE CREEK

1.6M W JCT USH 61, Grant, WI

Built 1968 Load: 24.3 t ADT: 80

LRD DEWEY ST

Fair

Over: BR MISSISSIPPI RIVER

0.1M W JCT STH 81, Grant, WI

Built 1962 Load: 24.3 t ADT: 822

CTH S

Fair

Over: SAUNDERS CREEK

1.6M N JCT CTH T, Grant, WI

Built 1950 Load: 24.3 t ADT: 280

LRD FAIRVIEW RD

Fair

Over: BACON BRANCH

0.9M N JCT CTH A, Grant, WI

Built 1950 Load: 24.3 t ADT: 80

LRD CANNON RD

Fair

Over: CANNON BRANCH

2.1M E JCT STH 81, Grant, WI

Built 1960 Load: 24.3 t ADT: 53

LRD BORAH RD

Fair

Over: BR BORAH CREEK

2.8M S JCT USH 18, Grant, WI

Built 1967 Load: 24.3 t ADT: 53

LRD ROCK RD

Fair

Over: SNOWDEN BRANCH

0.9M W JCT CTH D, Grant, WI

Built 1960 Load: 24.3 t ADT: 53

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

Related

Browse all → | Rankings →
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.