County profile · official public datasets

Cass County, MN

85 public highway bridges tracked in the FHWA National Bridge Inventory: 47.1% rated Good, 48.2% Fair, 4.7% Poor.

85
Public bridges
47.1%
Good condition
4.7%
Poor condition

The verdict

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

Cass County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

54th
of 87 on Poor share
4.7%
Poor-condition share
85
public highway bridges
1985
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.

Cass County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Cass County ranks #54 of 87 Minnesota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Cass County, Minnesota contains 85 public highway bridges. Roughly 47.1% are rated “Good,” 48.2% “Fair,” and 4.7% “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

85

Public highway bridges in Cass County

Good condition

47.1%

40 of 85 rated 7-9

Fair condition

48.2%

41 of 85 rated 5-6

Poor condition

4.7%

4 of 85 rated 4 or below

In-state Poor-share rank

#54 of 87

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

Condition distribution

Share of 85 NBI-tracked bridges by lowest applicable component rating.

Good
47.1% (40)
Fair
48.2% (41)
Poor
4.7% (4)

Cass County's Poor-condition bridges carry 200 vehicle crossings a day

That is 0.2% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 50 crossings a day against 951 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 85 of 85 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

32.9% of Cass County's bridges have passed the 50-year mark

28 of the 85 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 47.1% 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 45% of the county's Poor-condition bridge traffic

CR 133 over WILLOW RIVER, built 1957, carries 90 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 4-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 200 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Cass County's bridges were built

85 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 20 of the county's bridges still in the inventory were built, which is 23.5% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1985) matches the Minnesota average (1986).

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

How Cass County compares with Minnesota's closest counties by inventory size

The 5 Minnesota counties nearest Cass County in number of bridges, with their condition splits. Its 4.7% Poor share is the 4th-lowest of these 6. Its average build year of 1985 against a peer-group mean of 1987 is in line with the group.

Showing the 5 closest of 86 Minnesota counties eligible for comparison.

Bridge inventory size and condition shares for Cass County and the 5 Minnesota counties closest to it in inventory size
County Bridges Poor
Lake County 90 12.2%
Cass County (this page) 85 4.7%
Waseca County 83 8.4%
Kanabec County 82 3.7%
McLeod County 77 3.9%
Wadena County 77 3.9%

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 Cass 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 Cass County, both outside Minnesota so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MN (85 bridges here).

Similar average build year

Nearest mean year-built outside MN (1985 here).

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

All 85 Good 40 Fair 41 Poor 4

All bridges (85)

CR 107

Good

Over: HOME BROOK

3 MI SW OF LAKE SHORE, Cass, MN

Built 2019 Load: 32.4 t ADT: 65

CSAH 20

Good

Over: BEAVER CREEK

2.9 MI W;S OF JCT TH 64, Cass, MN

Built 1964 Load: 32.4 t ADT: 255

CSAH 58

Good

Over: LAWRENCE CREEK

0.3 MI N OF JCT TH 6, Cass, MN

Built 1962 Load: 33.0 t ADT: 790

CSAH 1

Good

Over: PILLAGER CREEK

0.1 MI S OF JCT TH 210, Cass, MN

Built 1984 Load: 35.6 t ADT: 4,650

T 474

Good

Over: BOY RIVER

1.5 MI S OF JCT CSAH 7, Cass, MN

Built 1996 Load: 35.9 t ADT: 32

CSAH 44

Good

Over: ARVIG CREEK

0.7 MI N OF JCT TH 371, Cass, MN

Built 1981 Load: 35.9 t ADT: 1,237

CSAH 44

Good

Over: ARVIG CREEK

0.1 MI N OF JCT TH 371, Cass, MN

Built 1986 Load: 35.9 t ADT: 1,237

CSAH 29

Good

Over: STONY BROOK

0.1 MI E OF JCT CSAH 78, Cass, MN

Built 1985 Load: 35.9 t ADT: 680

CSAH 57

Good

Over: WILLOW RIVER

1.6 MI S OF JCT TH 200, Cass, MN

Built 1992 Load: 35.9 t ADT: 60

CR 129

Good

Over: TRELIPE CREEK

0.4 MI N OF JCT CSAH 7, Cass, MN

Built 2018 Load: 36.0 t ADT: 145

T 474

Good

Over: BOY RIVER

1.1 MI S OF JCT CSAH 7, Cass, MN

Built 2016 Load: 36.3 t ADT: 81

MN 371

Good

Over: S FK PINE RIVER

2.0 MI SE OF PINE RIVER, Cass, MN

Built 1992 Load: 36.9 t ADT: 6,346

T 14

Good

Over: GULL RIVER

0.8 MI W OF CO LINE, Cass, MN

Built 2003 Load: 37.9 t ADT: 144

FR2127

Good

Over: BEAR BROOK

4.85 MI SE OF JCT US HWY2, Cass, MN

Built 2022 Load: 38.6 t ADT: 7

T 208

Good

Over: PILLAGER CREEK

0.2 MI S OF JCT TH 210, Cass, MN

Built 2002 Load: 38.8 t ADT: 50

CSAH 2

Good

Over: S FK PINE RIVER

AT JCT CSAH 26, Cass, MN

Built 1998 Load: 39.2 t ADT: 1,900

T 313

Good

Over: PINE RIVER

0.7 MI E OF JCT CSAH 42, Cass, MN

Built 1989 Load: 39.2 t ADT: 24

CSAH 2

Good

Over: BUNGO CREEK

0.2 MI E OF JCT CSAH 25, Cass, MN

Built 1998 Load: 40.8 t ADT: 990

M 26

Good

Over: LOWER GULL LAKE

IN EAST GULL LAKE, Cass, MN

Built 1998 Load: 40.8 t ADT: 50

CR 147

Good

Over: FOX CREEK

0.2 MI N OF JCT CR 146, Cass, MN

Built 2013 Load: 40.8 t ADT: 560

CSAH 1

Good

Over: MAYO CREEK

0.9 MI E OF JCT CSAH 28, Cass, MN

Built 2011 Load: 40.8 t ADT: 910

MN 87

Good

Over: BIG SWAMP CREEK

0.1 MI W OF S JCT TH 64, Cass, MN

Built 1998 Load: 40.8 t ADT: 2,002

CSAH 6

Good

Over: Boy River

0.7 mi W of jct TH 371, Cass, MN

Built 2002 Load: 42.4 t ADT: 840

CSAH 1

Good

Over: STONY BROOK

0.4 MI E OF JCT CSAH 24, Cass, MN

Built 2015 Load: 42.4 t ADT: 1,050

CSAH 13

Good

Over: ROOSEVELT CANAL

1.2 MI E OF JCT CSAH 72, Cass, MN

Built 2003 Load: 47.5 t ADT: 1,000

MN 84

Good

Over: NORWAY BROOK DAM

0.28 MI E OF MN 371, Cass, MN

Built 2021 Load: 48.0 t ADT: 3,064

CSAH 7

Good

Over: INGUADONA BAY

0.7 MI W OF JCT CR 129, Cass, MN

Built 2011 Load: 50.6 t ADT: 690

T 118

Good

Over: S FK PINE RIVER

0.7 MI E OF JCT CSAH 1, Cass, MN

Built 2013 Load: 50.8 t ADT: 98

CR 107

Good

Over: HOME BROOK

2.2 MI N OF JCT CSAH 15, Cass, MN

Built 2003 Load: 53.9 t ADT: 325

CR 120

Good

Over: STREAM

0.2 MI W OF JCT CSAH 54, Cass, MN

Built 2013 Load: 55.5 t ADT: 95

MN 6

Good

Over: ROOSEVELT LAKE

25.0 MI N OF JCT TH 210, Cass, MN

Built 1994 Load: 61.9 t ADT: 2,586

CR 133

Poor

Over: WILLOW RIVER

3.0 MI S OF JCT TH 200, Cass, MN

Built 1957 Load: 6.5 t ADT: 90

T 82

Poor

Over: MAYO CREEK

0.3 MI E OF JCT CSAH 17, Cass, MN

Built 1991 Load: 13.3 t ADT: 10

T 74

Poor

Over: MAYO CREEK

0.1 MI W OF E CO LINE, Cass, MN

Built 1985 Load: 22.9 t ADT: 20

CSAH 43

Poor

Over: ADA BROOK

0.6 MI S OF JCT CR 118, Cass, MN

Built 1956 Load: 41.2 t ADT: 80

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.