County profile · official public datasets

Roseau County, MN

142 public highway bridges tracked in the FHWA National Bridge Inventory: 69.7% rated Good, 27.5% Fair, 2.8% Poor.

142
Public bridges: 69.7%
Good condition: 2.8%
Poor condition

The verdict

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

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

Top 38%
lowest Poor share in state: 2.8%
Poor-condition share: 142
public highway bridges: 1989
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.

Roseau County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Roseau County ranks #33 of 87 Minnesota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.8%). Roseau County, Minnesota contains 142 public highway bridges. Roughly 69.7% are rated “Good,” 27.5% “Fair,” and 2.8% “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

142

Public highway bridges in Roseau County

Good condition

69.7%

99 of 142 rated 7-9

Fair condition

27.5%

39 of 142 rated 5-6

Poor condition

2.8%

4 of 142 rated 4 or below

In-state Poor-share rank

#33 of 87

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

Condition distribution

Share of 142 NBI-tracked bridges by lowest applicable component rating.

Good

69.7% (99)

Fair

27.5% (39)

Poor

2.8% (4)

Roseau County's Poor-condition bridges carry 67 vehicle crossings a day

That is 0.1% of the county's reported daily bridge traffic on 2.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 17 crossings a day against 356 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 142 of 142 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

25.4% of Roseau County's bridges have passed the 50-year mark

36 of the 142 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 69.7% 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 47.8% of the county's Poor-condition bridge traffic

T 26 over STREAM, built 1922, carries 32 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 67 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1930s

1
1950s

7
1960s

17
1970s

22
1980s

21
1990s

20
2000s

34
2010s

12
2020s

6

What this shows Construction peaked in the 2000s, when 34 of the county's bridges still in the inventory were built, which is 23.9% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1989) matches the Minnesota average (1986).

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

The 5 Minnesota counties nearest Roseau County in number of bridges, with their condition splits. Its 2.8% Poor share is the 4th-lowest of these 6. Its average build year of 1989 against a peer-group mean of 1986 is in line with the group.

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

Bridge inventory size and condition shares for Roseau County and the 5 Minnesota counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Carlton County	147	51.7%	39.5%	8.8%	1986
Wabasha County	147	60.5%	39.5%	0%	1985
Freeborn County	142	50.7%	46.5%	2.8%	1981
Rice County	142	40.8%	56.3%	2.8%	1986
Roseau County (this page)	142	69.7%	27.5%	2.8%	1989
Renville County	141	66%	24.1%	9.9%	1991

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

Similar inventory size

Nearest county inventories outside MN (142 bridges here).

Monroe County, AL · 142 bridges
Henderson County, IL · 142 bridges
Graham County, KS · 142 bridges
Kenton County, KY · 142 bridges

Similar average build year

Nearest mean year-built outside MN (1989 here).

Harris County, TX · avg 1989 · 4,029 bridges
Mecklenburg County, NC · avg 1989 · 746 bridges
Buffalo County, NE · avg 1989 · 459 bridges
Brazos County, TX · avg 1989 · 370 bridges

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

All 142 Good 99 Fair 39 Poor 4

Good-condition bridges (99)

Sort:

Roseau County Bridge Snapshot

Condition distribution

Roseau County's Poor-condition bridges carry 67 vehicle crossings a day

25.4% of Roseau County's bridges have passed the 50-year mark

One structure carries 47.8% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (99)

T 382

CSAH 28

CSAH 3

T 33

CSAH 20

CSAH 2

MN 89

T 142

MN 310

MN 32

MN 32

CSAH 2

CSAH 24

T 192

UT 407

MN 89

CSAH 12

T 179

T 306

CSAH 18

T 343

UT 2

UT 3

T 327

CSAH 34

CR 103

CSAH 13

CSAH 18

CSAH 9

CR 122

CSAH 2

CSAH 25

CSAH 18

CSAH 28

CSAH 12

CR 27

CSAH 22

CR 129

CR 125

T 462

T 167

T 218

T 290

T 207

T 288

T 57

T 182

T 185

T 881

T 209

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