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.

Total bridges

Public highway bridges in Minidoka County

Good condition

28.8%

19 of 66 rated 7-9

Fair condition

71.2%

47 of 66 rated 5-6

Poor condition

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.

1940s

1
1950s

3
1960s

20
1970s

13
1980s

3
1990s

6
2000s

8
2010s

7
2020s

5

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.

Bridge inventory size and condition shares for Minidoka County and the 5 Idaho counties closest to it in inventory size
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.

All 66 Good 19 Fair 47 Poor 0

Fair-condition bridges (47)

Sort:

Minidoka County Bridge Snapshot

Condition distribution

48.5% of Minidoka County's bridges have passed the 50-year mark

How Minidoka County compares with Idaho's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (47)

SMA7522;400 S. RD.

100 EAST ROAD

STC 7882;50 S. RD.

STC2866;BASELINE

F STREET

STC2866;300 N. RD.

200 NORTH ROAD

100 NORTH ROAD

STC 7832;H STREET

STC 2865;MERIDIAN

200 NORTH ROAD

300 EAST ROAD

SMA7812;100 S. RD.

300 SOUTH ROAD

100 NORTH ROAD

300 WEST ROAD

SMA7822;100 WEST R

SH 27

400 NORTH ROAD

SMA 7872; 8TH ST

STC2863;600 WEST R

I 84 EBL

I 84 WBL

500 WEST ROAD

MERIDIAN ROAD

850 WEST ROAD

SH 25

I 84B NBL

I 84B SBL

I 84 EBL

I 84 WBL

SH 24

200 WEST ROAD

100 EAST ROAD

STC2866;BASELINE R

I 84 EBL

I 84 WBL

I 84 EBL

I 84 WBL

STC 7832;H STREET

STC2863;600 WEST R

I 84 EBL

300 SOUTH ROAD

SH 24

SH 25

SH 24

SH 25

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