Total bridges
98
Public highway bridges in Koochiching County
County profile · official public datasets
Koochiching County, MN
98 public highway bridges tracked in the FHWA National Bridge Inventory: 54.1% rated Good, 38.8% Fair, 7.1% Poor.
- 98
- Public bridges
- 54.1%
- Good condition
- 7.1%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Koochiching County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- 70th
- of 87 on Poor share
- 7.1%
- Poor-condition share
- 98
- public highway bridges
- 1987
- 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.
Koochiching County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Koochiching County ranks #70 of 87 Minnesota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.1%). Koochiching County, Minnesota contains 98 public highway bridges. Roughly 54.1% are rated “Good,” 38.8% “Fair,” and 7.1% “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.
Good condition
54.1%
53 of 98 rated 7-9
Fair condition
38.8%
38 of 98 rated 5-6
Poor condition
7.1%
7 of 98 rated 4 or below
In-state Poor-share rank
#70 of 87
Among Minnesota counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 98 NBI-tracked bridges by lowest applicable component rating.
Good 54.1% (53)
Fair 38.8% (38)
Poor 7.1% (7)
Koochiching County's Poor-condition bridges carry 2,423 vehicle crossings a day
That is 6.5% of the county's reported daily bridge traffic on 7.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 346 crossings a day against 241 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 98 of 98 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
16.3% of Koochiching County's bridges have passed the 50-year mark
16 of the 98 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 54.1% 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 60.2% of the county's Poor-condition bridge traffic
US 71 over LITTLE FORK RIVER, built 1980, carries 1,458 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 2,423 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Koochiching County's bridges were built
98 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 1
1930–1939
1 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 2
1950–1959
2 bridges
- 1960s 7
1960–1969
7 bridges
- 1970s
1970–1979
20 bridges
- 1980s
1980–1989
28 bridges
- 1990s 11
1990–1999
11 bridges
- 2000s 11
2000–2009
11 bridges
- 2010s 11
2010–2019
11 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1980s, when 28 of the county's bridges still in the inventory were built, which is 28.6% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1987) matches the Minnesota average (1986).
How Koochiching County compares with Minnesota's closest counties by inventory size
The 5 Minnesota counties nearest Koochiching County in number of bridges, with their condition splits. Its 7.1% Poor share is the 4th-lowest of these 6. Its average build year of 1987 against a peer-group mean of 1988 is in line with the group.
Showing the 5 closest of 86 Minnesota counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Sibley County | 102 | 61.8% | 37.3% | 1% | 1994 |
| Beltrami County | 101 | 63.4% | 33.7% | 3% | 1989 |
| Koochiching County (this page) | 98 | 54.1% | 38.8% | 7.1% | 1987 |
| Swift County | 97 | 75.3% | 23.7% | 1% | 1993 |
| Aitkin County | 96 | 55.2% | 36.5% | 8.3% | 1985 |
| Kandiyohi County | 94 | 48.9% | 43.6% | 7.4% | 1980 |
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 Koochiching 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 Koochiching County, both outside Minnesota so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MN (98 bridges here).
- Boone County, AR · 98 bridges
- Van Buren County, AR · 98 bridges
- Dougherty County, GA · 98 bridges
- Butler County, KY · 98 bridges
Similar average build year
Nearest mean year-built outside MN (1987 here).
- St. Louis County, MO · avg 1987 · 912 bridges
- Ellis County, TX · avg 1987 · 691 bridges
- Palm Beach County, FL · avg 1987 · 610 bridges
- Dane County, WI · avg 1987 · 590 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (98)
UT 145
FairOver: CROSS RIVER
0.1 MI E OF JCT TH 65, Koochiching, MN
Built 1986 Load: 13.6 t ADT: 1
MN 217
FairOver: LITTLE FORK RIVER
0.1 MI E OF JCT TH 65, Koochiching, MN
Built 1963 Load: 17.2 t ADT: 1,217
CR 82
FairOver: W BR BLACK RIVER
0.5 MI W OF JCT TH 11, Koochiching, MN
Built 1978 Load: 17.6 t ADT: 50
IRR BIA RTE 5
FairOver: NETT LAKE RIVER
3.7 KM NORTH OF HWY 65, Koochiching, MN
Built 1962 Load: 20.9 t ADT: 30
MN 11
FairOver: STREAM
1.4 MI E OF S JCT TH 53, Koochiching, MN
Built 1949 Load: 25.5 t ADT: 5,227
SFR 97
FairOver: LOST RIVER
7.5 MI E OF W CO LINE, Koochiching, MN
Built 1981 Load: 26.1 t ADT: 1
UT 79
FairOver: BEAVER BROOK
0.6 MI N OF JCT CSAH 8, Koochiching, MN
Built 1980 Load: 29.4 t ADT: 24
US 71
FairOver: DINNER CREEK
10.7 MI S OF BIG FALLS, Koochiching, MN
Built 1955 Load: 29.4 t ADT: 695
US 71
FairOver: BEAR RIVER
12.4 MI SW OF JCT TH 65, Koochiching, MN
Built 1977 Load: 29.4 t ADT: 1,155
CR 119
FairOver: E BR RAT ROOT RIVER
1.5 MI NE OF JCT TH 53, Koochiching, MN
Built 1977 Load: 29.4 t ADT: 36
IRR BIA RTE 5
FairOver: WOOD DUCK CREEK
10 KM NORTH OF HWY 65, Koochiching, MN
Built 1993 Load: 29.9 t ADT: 20
SFR 89
FairOver: CALDWELL BROOK
15.0 MILES NE OF TH 1, Koochiching, MN
Built 1970 Load: 30.7 t ADT: 2
US 53
FairOver: RAINY RIVER
0.3 MI N OF JCT TH 11, Koochiching, MN
Built 1980 Load: 31.0 t ADT: 1,251
US 53
FairOver: DWP RY
1.4 MI N OF RAY, Koochiching, MN
Built 1985 Load: 31.7 t ADT: 1,603
MN 6
FairOver: BIG FORK RIVER
14.2 MI S OF JCT TH 71, Koochiching, MN
Built 1977 Load: 32.2 t ADT: 275
CSAH 22
FairOver: BEAVER BROOK
1.2 MI N OF JCT TH 217, Koochiching, MN
Built 1970 Load: 32.3 t ADT: 453
MN 217
FairOver: RAT ROOT RIVER
10.5 MI E OF LITTLE FORK, Koochiching, MN
Built 1956 Load: 32.5 t ADT: 214
MN 11
FairOver: WEST FORK BLACK RIVER
1.2 MI NW OF LOMAN, Koochiching, MN
Built 1986 Load: 33.0 t ADT: 548
US 53
FairOver: RAT ROOT RIVER
1.5 MI NW OF ERICSBURG, Koochiching, MN
Built 1976 Load: 33.3 t ADT: 2,833
MN 11
FairOver: BLACK RIVER
AT LOMAN, Koochiching, MN
Built 1986 Load: 33.9 t ADT: 731
SFR 245
FairOver: CALDWELL BROOK
1.4 MI N OF CR 54 (150, Koochiching, MN
Built 1989 Load: 34.0 t ADT: 2
UT 160
FairOver: BOISE CASCADE /BEAVER BR
6.0 MI S OF JCT CSAH 29, Koochiching, MN
Built 1989 Load: 35.4 t ADT: 10
UT 198
FairOver: BEAVER BROOK
4.6 MI S OF JCT TH 217, Koochiching, MN
Built 1985 Load: 36.1 t ADT: 5
CSAH 8
FairOver: NETT LAKE RIVER
3.0 MI NE JCT MN 65, Koochiching, MN
Built 2007 Load: 36.9 t ADT: 40
SFR 90
FairOver: CALDWELL BROOK
8.7 MI W OF JCT TH 6, Koochiching, MN
Built 1989 Load: 37.9 t ADT: 2
MN 6
FairOver: BIG FORK RIVER
19.8 MI S OF JCT TH 71, Koochiching, MN
Built 1977 Load: 38.8 t ADT: 275
CR 73
FairOver: CROSS RIVER
2.5 MI E OF JCT TH 65, Koochiching, MN
Built 1979 Load: 39.2 t ADT: 47
CR 76
FairOver: STREAM
1.6 MI E OF JCT TH 65, Koochiching, MN
Built 1981 Load: 39.2 t ADT: 42
CSAH 98
FairOver: RAT ROOT RIVER
0.1 MI N OF JCT TH 53, Koochiching, MN
Built 1972 Load: 39.4 t ADT: 110
MN 11
FairOver: BIG FORK RIVER
7.1 MI W OF JCT TH 71, Koochiching, MN
Built 1992 Load: 40.8 t ADT: 731
CR 88
FairOver: MC CLOUD CREEK
1.8 MI E OF JCT CR 87, Koochiching, MN
Built 2003 Load: 40.8 t ADT: 8
MN 217
FairOver: BEAVER BROOK
2.4 MI E OF JCT TH 65, Koochiching, MN
Built 1976 Load: 41.0 t ADT: 214
MN 65
FairOver: LITTLE FORK RIVER
14.5 MI S OF JCT TH 71, Koochiching, MN
Built 2003 Load: 41.2 t ADT: 36
CSAH 75
FairOver: LITTLE FORK RIVER
2.3 MI SE OF JCT TH 65, Koochiching, MN
Built 1985 Load: 41.8 t ADT: 25
MN 11
FairOver: LITTLE FORK RIVER
0.5 MI W OF JCT TH 71, Koochiching, MN
Built 1994 Load: 42.8 t ADT: 1,247
CR 82
FairOver: W BR BLACK RIVER
2.1 MI W OF JCT TH 11, Koochiching, MN
Built 1986 Load: 43.1 t ADT: 50
US 71
FairOver: BIG FORK RIVER (N CHAN)
0.4 MI N OF JCT TH 6, Koochiching, MN
Built 1979 Load: 63.2 t ADT: 1,292
US 71
FairOver: BIG FORK RIVER (S CHAN)
0.3 MI N OF JCT TH 6, Koochiching, MN
Built 1979 Load: 74.5 t ADT: 1,292
CSAH 10
GoodOver: BEAR RIVER
4.7 MI N OF JCT CSAH 1, Koochiching, MN
Built 1966 Load: 17.1 t ADT: 41
US 71
GoodOver: BILLY CREEK
2.0 MI SW OF JCT TH 6, Koochiching, MN
Built 1986 Load: 29.4 t ADT: 721
US 53
GoodOver: E BR RAT ROOT RIVER
2.9 MI S OF JCT TH 217, Koochiching, MN
Built 1964 Load: 31.2 t ADT: 1,733
CR 71
GoodOver: CROSS RIVER
0.9 MI E OF JCT TH65, Koochiching, MN
Built 2013 Load: 32.4 t ADT: 5
CR 70
GoodOver: CROSS RIVER
1.0 MI S OF JCT TH 65, Koochiching, MN
Built 2020 Load: 32.4 t ADT: 11
CSAH 8
GoodOver: ESTER BROOK
1.3 MI S OF JCT CR 80, Koochiching, MN
Built 2017 Load: 32.4 t ADT: 27
CSAH 1
GoodOver: BEAR RIVER
0.5 MI W OF JCT CR 81, Koochiching, MN
Built 2021 Load: 32.4 t ADT: 160
MN 65
GoodOver: HAY CREEK
7.9 MI S OF JCT TH 71, Koochiching, MN
Built 2013 Load: 32.4 t ADT: 73
MN 65
GoodOver: PRAIRIE CREEK
11.1 MI N OF COUNTY LINE, Koochiching, MN
Built 2013 Load: 32.4 t ADT: 36
UT 100
GoodOver: BLACK RIVER
0.4 MI S OF JCT CSAH 32, Koochiching, MN
Built 1980 Load: 32.7 t ADT: 1
CSAH 18
GoodOver: RAPID RIVER
1.1 MI SE OF JCT TH 11, Koochiching, MN
Built 1976 Load: 33.0 t ADT: 76
SFR 90
GoodOver: PLUM CREEK
2.2 MI W OF JCT TH 6, Koochiching, MN
Built 1989 Load: 33.0 t ADT: 2
Read our methodology - how this data is sourced, computed, and verified.
Related
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.