Total bridges
54
Public highway bridges in Schoolcraft County
County profile · official public datasets
Schoolcraft County, MI
54 public highway bridges tracked in the FHWA National Bridge Inventory: 27.8% rated Good, 66.7% Fair, 5.6% Poor.
- 54
- Public bridges
- 27.8%
- Good condition
- 5.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Schoolcraft County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 17%
- lowest Poor share in state
- 5.6%
- Poor-condition share
- 54
- public highway bridges
- 1967
- 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.
Schoolcraft County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Schoolcraft County ranks #14 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.6%). Schoolcraft County, Michigan contains 54 public highway bridges. Roughly 27.8% are rated “Good,” 66.7% “Fair,” and 5.6% “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
27.8%
15 of 54 rated 7-9
Fair condition
66.7%
36 of 54 rated 5-6
Poor condition
5.6%
3 of 54 rated 4 or below
In-state Poor-share rank
#14 of 83
Among Michigan counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 54 NBI-tracked bridges by lowest applicable component rating.
Good 27.8% (15)
Fair 66.7% (36)
Poor 5.6% (3)
Schoolcraft County's Poor-condition bridges carry 70 vehicle crossings a day
That is 0.1% of the county's reported daily bridge traffic on 5.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 23 crossings a day against 353 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 54 of 54 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
61.1% of Schoolcraft County's bridges have passed the 50-year mark
33 of the 54 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 27.8% 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 71.4% of the county's Poor-condition bridge traffic
NO DATA ENTERED over S BRANCH STUTTS CREEK, built 1996, carries 50 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 3-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 70 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Schoolcraft County's bridges were built
54 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s 3
1930–1939
3 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s
1950–1959
18 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s 5
1970–1979
5 bridges
- 1980s 3
1980–1989
3 bridges
- 1990s 6
1990–1999
6 bridges
- 2010s 6
2010–2019
6 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1950s, when 18 of the county's bridges still in the inventory were built, which is 33.3% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1967, 9 years older than the Michigan average of 1976.
How Schoolcraft County compares with Michigan's closest counties by inventory size
The 5 Michigan counties nearest Schoolcraft County in number of bridges, with their condition splits. Its 5.6% Poor share is the 2nd-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1970 is in line with the group.
Showing the 5 closest of 82 Michigan counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Houghton County | 58 | 63.8% | 32.8% | 3.4% | 1984 |
| Crawford County | 54 | 14.8% | 66.7% | 18.5% | 1971 |
| Iron County | 54 | 20.4% | 59.3% | 20.4% | 1967 |
| Schoolcraft County (this page) | 54 | 27.8% | 66.7% | 5.6% | 1967 |
| Alger County | 53 | 30.2% | 58.5% | 11.3% | 1956 |
| Cass County | 52 | 25% | 59.6% | 15.4% | 1970 |
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 Schoolcraft 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 Schoolcraft County, both outside Michigan so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MI (54 bridges here).
- Rio Blanco County, CO · 54 bridges
- Brantley County, GA · 54 bridges
- Jones County, GA · 54 bridges
- Larue County, KY · 54 bridges
Similar average build year
Nearest mean year-built outside MI (1967 here).
- Los Angeles County, CA · avg 1967 · 3,547 bridges
- Allegheny County, PA · avg 1967 · 1,294 bridges
- Sonoma County, CA · avg 1967 · 609 bridges
- Merced County, CA · avg 1967 · 528 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (15)
AUTO TOUR ROUTE
GoodOver: C TO B SPILLWAY
SEC 29 T45N R13W, Schoolcraft, MI
Built 1953 Load: 13.6 t ADT: 120
AUTO TOUR ROUTE
GoodOver: E TO C SPILLWAY
SEC 20 T45N R13W, Schoolcraft, MI
Built 1952 Load: 17.2 t ADT: 90
WAGNER-TAYLOR DM R
GoodOver: WEST BR FOX RIVER
10 MI NW OF SENEY, Schoolcraft, MI
Built 2019 Load: 24.9 t ADT: 10
DNR TRAIL 440
GoodOver: FOX RIVER
5.5 MI W OF LAVENDER CRNR, Schoolcraft, MI
Built 2019 Load: 24.9 t ADT: 5
COUNTY ROAD 436
GoodOver: BEAR CREEK
1.5 MI N OF COUNTY RD 433, Schoolcraft, MI
Built 2011 Load: 31.0 t ADT: 163
FISHING LOOP
GoodOver: E TO D SPILLWAY
SEC 30 T45N R13W, Schoolcraft, MI
Built 1954 Load: 32.7 t ADT: 50
FISHING LOOP ROAD
GoodOver: F TO E SPILLWAY
SEC 20 T45N R13W, Schoolcraft, MI
Built 1954 Load: 32.7 t ADT: 50
BASS LAKE RD
GoodOver: INDIAN RIVER
0.1 MI S OF COUNTY RD 437, Schoolcraft, MI
Built 1976 Load: 33.4 t ADT: 87
M-94
GoodOver: INDIAN RIVER
1.5 MI N OF US-2, Schoolcraft, MI
Built 1954 Load: 36.3 t ADT: 2,701
TEN CURVES RD H44
GoodOver: MANISTIQUE RIVER
IN GERMFASK, Schoolcraft, MI
Built 2013 Load: 36.3 t ADT: 809
COUNTY ROAD P449
GoodOver: INDIAN RIVER
4.6 MI S OF M-94, Schoolcraft, MI
Built 1982 Load: 38.2 t ADT: 27
M-149
GoodOver: DUFOUR CREEK
2.4 MI N OF THOMPSON, Schoolcraft, MI
Built 2014 Load: 48.6 t ADT: 430
COUNTY ROAD P440
GoodOver: INDIAN RIVER
0.2 MI N OF COUNTY RD 441, Schoolcraft, MI
Built 2015 Load: 48.9 t ADT: 605
COUNTY ROAD P448
GoodOver: STUTTS CREEK
16.7 MI S OF M-28, Schoolcraft, MI
Built 2023 Load: 55.1 t ADT: 100
FISHING LOOP
GoodOver: J TO H SPILLWAY
SEC 18 T45N R13W, Schoolcraft, MI
Built 1943 Load: 60.8 t ADT: 50
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.