Total bridges
139
Public highway bridges in Adair County
County profile · official public datasets
Adair County, OK
139 public highway bridges tracked in the FHWA National Bridge Inventory: 35.3% rated Good, 50.4% Fair, 14.4% Poor.
- 139
- Public bridges
- 35.3%
- Good condition
- 14.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Adair County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 69th
- of 77 on Poor share
- 14.4%
- Poor-condition share
- 139
- public highway bridges
- 1970
- 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.
Adair County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Adair County ranks #69 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 14.4%). Adair County, Oklahoma contains 139 public highway bridges. Roughly 35.3% are rated “Good,” 50.4% “Fair,” and 14.4% “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
35.3%
49 of 139 rated 7-9
Fair condition
50.4%
70 of 139 rated 5-6
Poor condition
14.4%
20 of 139 rated 4 or below
In-state Poor-share rank
#69 of 77
Among Oklahoma counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 139 NBI-tracked bridges by lowest applicable component rating.
Good 35.3% (49)
Fair 50.4% (70)
Poor 14.4% (20)
Adair County's Poor-condition bridges carry 4,331 vehicle crossings a day
That is 2.8% of the county's reported daily bridge traffic on 14.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 217 crossings a day against 1,204 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 139 of 139 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
56.8% of Adair County's bridges have passed the 50-year mark
79 of the 139 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 35.3% 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 14.4% of the county's Poor-condition bridge traffic
E0850 (0150C) over CREEK, built 1943, carries 624 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 20-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 4,331 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Adair County's bridges were built
139 bridges with a recorded construction year, grouped by decade
- 1920s 5
1920–1929
5 bridges
- 1930s
1930–1939
34 bridges
- 1940s 11
1940–1949
11 bridges
- 1950s
1950–1959
20 bridges
- 1960s 3
1960–1969
3 bridges
- 1970s 7
1970–1979
7 bridges
- 1980s 8
1980–1989
8 bridges
- 1990s
1990–1999
17 bridges
- 2000s
2000–2009
14 bridges
- 2010s
2010–2019
16 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1930s, when 34 of the county's bridges still in the inventory were built, which is 24.5% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1970, 7 years older than the Oklahoma average of 1977.
How Adair County compares with Oklahoma's closest counties by inventory size
The 5 Oklahoma counties nearest Adair County in number of bridges, with their condition splits. Its 14.4% Poor share is the 6th-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1975 is 5 years older.
Showing the 5 closest of 76 Oklahoma counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Jefferson County | 150 | 46.7% | 46% | 7.3% | 1975 |
| Coal County | 142 | 38.7% | 54.9% | 6.3% | 1974 |
| Adair County (this page) | 139 | 35.3% | 50.4% | 14.4% | 1970 |
| Love County | 133 | 42.1% | 56.4% | 1.5% | 1977 |
| Murray County | 129 | 46.5% | 51.2% | 2.3% | 1976 |
| Harper County | 128 | 33.6% | 64.8% | 1.6% | 1975 |
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 Adair 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 Adair County, both outside Oklahoma so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside OK (139 bridges here).
- Bulloch County, GA · 139 bridges
- St. Helena County, LA · 139 bridges
- Garrett County, MD · 139 bridges
- Midland County, MI · 139 bridges
Similar average build year
Nearest mean year-built outside OK (1970 here).
- Hamilton County, OH · avg 1970 · 783 bridges
- Yavapai County, AZ · avg 1970 · 543 bridges
- San Luis Obispo County, CA · avg 1970 · 401 bridges
- Somerset County, NJ · avg 1970 · 397 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (70)
N4614 (0110C)
FairOver: CREEK
3.7SW .5E OF NW C/L, Adair, OK
Built 1963 Load: 32.7 t ADT: 350
S.H. 10
FairOver: WINSET HOLLOW CREEK
1.1 MI.E.CHEROKEE CO, Adair, OK
Built 1972 Load: 32.7 t ADT: 1,600
U.S. 62
FairOver: BEN KNIGHT CREEK
11.6 MI.E.CHEROKEE CL, Adair, OK
Built 1974 Load: 32.7 t ADT: 1,500
U.S. 62
FairOver: TYNER CREEK
1.6E OF CHEROKEE C/L, Adair, OK
Built 2009 Load: 32.7 t ADT: 1,000
N4650 (0116C)
FairOver: TYNER CREEK
3E 4.3N OF PROCTOR, Adair, OK
Built 1990 Load: 32.8 t ADT: 100
U.S. 59
FairOver: REESE CREEK
4.5 MI.N.JCT.SH 51, Adair, OK
Built 1935 Load: 32.9 t ADT: 4,500
N4629 (0124C)
FairOver: BIDDING SPRINGS CREEK
3S 2E OF SH 51, Adair, OK
Built 1955 Load: 34.7 t ADT: 263
S.H. 100
FairOver: W. BRANCH JENKINS CREEK
2.1 MI.E.JCT.US59, Adair, OK
Built 1932 Load: 35.7 t ADT: 1,600
E0940 (0146C)
FairOver: LITTLE LEE CREEK
10.6E 1N OF SW CO.LIN, Adair, OK
Built 2002 Load: 37.2 t ADT: 138
U.S. 59
FairOver: YELLOW SPRING CREEK
3.6 MI.N.SEQUOYAH CO, Adair, OK
Built 1935 Load: 38.6 t ADT: 1,900
S.H. 51
FairOver: EVANSVILLE CREEK
2.9 MI.E.JCT.US59, Adair, OK
Built 1959 Load: 39.4 t ADT: 690
U.S. 59
FairOver: SHELL BRANCH CREEK
7.0 MI.N.JCT.SH 51, Adair, OK
Built 1957 Load: 40.4 t ADT: 3,800
U.S. 62
FairOver: PEACH EATER CREEK
6.1 MI.E.CHEROKEE CO, Adair, OK
Built 2002 Load: 42.8 t ADT: 1,000
U.S. 59 NB
FairOver: ILLINOIS RIVER
10.6N JCT US62/US59, Adair, OK
Built 2009 Load: 53.9 t ADT: 3,200
U.S. 59 SB
FairOver: ILLINOIS RIVER
10.6N JCT US62/US59, Adair, OK
Built 2009 Load: 53.9 t ADT: 3,750
S.H. 100
FairOver: MIDDLE BR./JENKINS CREEK
3.1 MI.E.JCT.US59, Adair, OK
Built 1932 Load: 67.0 t ADT: 1,600
U.S. 59
FairOver: KANSAS CITY SOUTHERN R.R
12.24 MI N SEQUOYAH CO, Adair, OK
Built 1998 Load: 67.7 t ADT: 8,000
U.S. 59
FairOver: S.BRANCH SALLISAW CREEK
10.2 MI.N.SEQUOYAH CL, Adair, OK
Built 1935 Load: 82.2 t ADT: 4,400
U.S. 59
FairOver: UNNAMED CREEK
3.5 MI.N.JCT.SH 51, Adair, OK
Built 1934 Load: 99.9 t ADT: 4,500
S.H. 51
FairOver: BIDDING SPRINGS
3.5 MI.SE.CHEROKEE CL, Adair, OK
Built 1937 Load: 99.9 t ADT: 2,800
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.