County profile · official public datasets

Morrison County, MN

164 public highway bridges tracked in the FHWA National Bridge Inventory: 62.2% rated Good, 33.5% Fair, 4.3% Poor.

164
Public bridges: 62.2%
Good condition: 4.3%
Poor condition

The verdict

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

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

46th
of 87 on Poor share: 4.3%
Poor-condition share: 164
public highway bridges: 1988
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.

Morrison County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Morrison County ranks #46 of 87 Minnesota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.3%). Morrison County, Minnesota contains 164 public highway bridges. Roughly 62.2% are rated “Good,” 33.5% “Fair,” and 4.3% “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

164

Public highway bridges in Morrison County

Good condition

62.2%

102 of 164 rated 7-9

Fair condition

33.5%

55 of 164 rated 5-6

Poor condition

4.3%

7 of 164 rated 4 or below

In-state Poor-share rank

#46 of 87

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

Condition distribution

Share of 164 NBI-tracked bridges by lowest applicable component rating.

Good

62.2% (102)

Fair

33.5% (55)

Poor

4.3% (7)

Morrison County's Poor-condition bridges carry 3,644 vehicle crossings a day

That is 1.5% of the county's reported daily bridge traffic on 4.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 521 crossings a day against 1,286 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 164 of 164 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

25.6% of Morrison County's bridges have passed the 50-year mark

42 of the 164 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 62.2% 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 28.8% of the county's Poor-condition bridge traffic

CSAH 21 over S BR TWO RIVERS, built 1970, carries 1,050 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 7-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 3,644 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

3
1930s

3
1940s

4
1950s

2
1960s

6
1970s

41
1980s

20
1990s

33
2000s

26
2010s

19
2020s

7

What this shows Construction peaked in the 1970s, when 41 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1988) matches the Minnesota average (1986).

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

The 5 Minnesota counties nearest Morrison County in number of bridges, with their condition splits. Its 4.3% Poor share is the 3rd-lowest of these 6. Its average build year of 1988 against a peer-group mean of 1983 is 5 years newer.

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

Bridge inventory size and condition shares for Morrison County and the 5 Minnesota counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Pine County	171	63.2%	32.2%	4.7%	1987
Itasca County	170	50%	44.7%	5.3%	1985
Watonwan County	167	69.5%	29.9%	0.6%	1978
Morrison County (this page)	164	62.2%	33.5%	4.3%	1988
Martin County	162	56.2%	34.6%	9.3%	1975
Kittson County	160	71.9%	25.6%	2.5%	1988

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

Similar inventory size

Nearest county inventories outside MN (164 bridges here).

Sevier County, AR · 164 bridges
Cherokee County, GA · 164 bridges
Pawnee County, KS · 164 bridges
Choctaw County, MS · 164 bridges

Similar average build year

Nearest mean year-built outside MN (1988 here).

Travis County, TX · avg 1988 · 1,544 bridges
Grant County, OK · avg 1988 · 476 bridges
Loudoun County, VA · avg 1988 · 442 bridges
Licking County, OH · avg 1988 · 439 bridges

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

All 164 Good 102 Fair 55 Poor 7

Good-condition bridges (102)

Sort:

Morrison County Bridge Snapshot

Condition distribution

Morrison County's Poor-condition bridges carry 3,644 vehicle crossings a day

25.6% of Morrison County's bridges have passed the 50-year mark

One structure carries 28.8% of the county's Poor-condition bridge traffic

How Morrison 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 (102)

CSAH 6

US 10

T 334

CSAH 43

T 141

CR 266

CSAH 17

T 353

CSAH 16

CSAH 76

T 445

T 462

CSAH 52

CSAH 52

T 373

CSAH 23

T 250

T 138

T 259

T 164

T 139

CSAH 39

CSAH 39

M 8

T 162

M 12

M 5

CSAH 104

CSAH 51

T 353

CSAH 33

T 458

T 152

CSAH 21

CR 275

CR 241

T 454

T 114

T 154

T 145

US 10

US 10

M 4

MN 27

T 259

US 10

US 10

CSAH 13

US 10

CSAH 51

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