Total bridges
66
Public highway bridges in Minidoka County
County profile · official public datasets
Minidoka County, ID
66 public highway bridges tracked in the FHWA National Bridge Inventory: 28.8% rated Good, 71.2% Fair, 0% Poor.
- 66
- Public bridges
- 28.8%
- Good condition
- 0%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Minidoka County posts a top-quartile lowest Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 11%
- lowest Poor share in state
- 0%
- Poor-condition share
- 66
- public highway bridges
- 1983
- 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.
Minidoka County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Minidoka County ranks #5 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Minidoka County, Idaho contains 66 public highway bridges. Roughly 28.8% are rated “Good,” 71.2% “Fair,” and 0% “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
28.8%
19 of 66 rated 7-9
Fair condition
71.2%
47 of 66 rated 5-6
Poor condition
0%
0 of 66 rated 4 or below
In-state Poor-share rank
#5 of 44
Among Idaho counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 66 NBI-tracked bridges by lowest applicable component rating.
Good 28.8% (19)
Fair 71.2% (47)
Poor 0% (0)
48.5% of Minidoka County's bridges have passed the 50-year mark
32 of the 66 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 28.8% 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.
When Minidoka County's bridges were built
66 bridges with a recorded construction year, grouped by decade
- 1940s 1
1940–1949
1 bridges
- 1950s 3
1950–1959
3 bridges
- 1960s
1960–1969
20 bridges
- 1970s
1970–1979
13 bridges
- 1980s 3
1980–1989
3 bridges
- 1990s 6
1990–1999
6 bridges
- 2000s
2000–2009
8 bridges
- 2010s 7
2010–2019
7 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1960s, when 20 of the county's bridges still in the inventory were built, which is 30.3% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1983) matches the Idaho average (1979).
How Minidoka County compares with Idaho's closest counties by inventory size
The 5 Idaho counties nearest Minidoka County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1975 is 8 years newer.
Showing the 5 closest of 43 Idaho counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Nez Perce County | 71 | 28.2% | 69% | 2.8% | 1977 |
| Power County | 70 | 28.6% | 68.6% | 2.9% | 1973 |
| Minidoka County (this page) | 66 | 28.8% | 71.2% | 0% | 1983 |
| Payette County | 65 | 13.8% | 81.5% | 4.6% | 1970 |
| Camas County | 61 | 27.9% | 62.3% | 9.8% | 1978 |
| Gem County | 57 | 28.1% | 70.2% | 1.8% | 1976 |
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 Minidoka 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 Minidoka County, both outside Idaho so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside ID (66 bridges here).
- Chugach County, AK · 66 bridges
- Inyo County, CA · 66 bridges
- Broomfield County, CO · 66 bridges
- Cook County, GA · 66 bridges
Similar average build year
Nearest mean year-built outside ID (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (19)
300 WEST ROAD
GoodOver: B-4 CANAL
1.1 S. 3.0 E. PAUL, Minidoka, ID
Built 1968 Load: 22.7 t ADT: 100
400 North Road
GoodOver: Main Northside Canal
4.0 N 9.3E. RUPERT, Minidoka, ID
Built 1980 Load: 31.6 t ADT: 120
BASELINE ROAD
GoodOver: C-2 CANAL
1.0 N. 0.8 W. PAUL, Minidoka, ID
Built 1999 Load: 33.6 t ADT: 150
SMA 7841;A STREET
GoodOver: B CANAL
IN RUPERT, Minidoka, ID
Built 2014 Load: 35.0 t ADT: 3,100
500 WEST ROAD
GoodOver: C CANAL
0.7 N. 1.0 E. PAUL, Minidoka, ID
Built 2001 Load: 35.4 t ADT: 100
200 EAST ROAD
GoodOver: B-1 CANAL
0.4 S 1.6 W ACEQUIA, Minidoka, ID
Built 2019 Load: 36.3 t ADT: 300
200 WEST ROAD
GoodOver: A CANAL
0.7 S. 3.6 E. HEYBURN, Minidoka, ID
Built 2020 Load: 36.3 t ADT: 800
200 WEST ROAD
GoodOver: B-2 CANAL
1.5 N. 2.0 W. RUPERT, Minidoka, ID
Built 2020 Load: 37.6 t ADT: 200
200 SOUTH ROAD
GoodOver: A CANAL
2.0 S 1.0 E RUPERT, Minidoka, ID
Built 2003 Load: 38.1 t ADT: 150
I 84 WBL
GoodOver: SNAKE RIVER
3.0 N. DECLO, Minidoka, ID
Built 2016 Load: 38.9 t ADT: 9,250
400 S. ROAD
GoodOver: A-5 CANAL
0.6 N. 3.7 E. HEYBURN, Minidoka, ID
Built 2016 Load: 39.5 t ADT: 500
500 SOUTH ROAD
GoodOver: A-5 CANAL
0.7 S. 3.6 E. HEYBURN, Minidoka, ID
Built 2020 Load: 39.5 t ADT: 1,100
STC2866;300 N. RD.
GoodOver: MAIN NORTHSIDE CANAL
ACEQUIA, Minidoka, ID
Built 2001 Load: 40.8 t ADT: 270
STC2869;400 W. RD.
GoodOver: C CANAL
2.0 E 0.8 N PAUL, Minidoka, ID
Built 2007 Load: 43.5 t ADT: 950
100 NORTH ROAD
GoodOver: A CANAL
1.0 N. 1.9 E. RUPERT, Minidoka, ID
Built 2009 Load: 47.2 t ADT: 150
SH 25
GoodOver: A CANAL
1.3 E. RUPERT, Minidoka, ID
Built 2000 Load: 49.0 t ADT: 3,600
200 S 275 W
GoodOver: B-4 CANAL
2.0 S. 2.7 W. RUPERT, Minidoka, ID
Built 2023 Load: 52.5 t ADT: 200
W 600 N
GoodOver: MAIN DRAIN
6.0 N Rupert, Minidoka, ID
Built 2023 Load: 78.1 t ADT: 10
MERIDIAN ROAD
GoodOver: A CANAL
0.8N 4.5 E HEYBURN, Minidoka, ID
Built 2011 Load: 99.9 t ADT: 1,200
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.