Total bridges
128
Public highway bridges in Harper County
County profile · official public datasets
Harper County, OK
128 public highway bridges tracked in the FHWA National Bridge Inventory: 33.6% rated Good, 64.8% Fair, 1.6% Poor.
- 128
- Public bridges
- 33.6%
- Good condition
- 1.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Harper County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 14%
- lowest Poor share in state
- 1.6%
- Poor-condition share
- 128
- public highway bridges
- 1975
- 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.
Harper County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Harper County ranks #11 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.6%). Harper County, Oklahoma contains 128 public highway bridges. Roughly 33.6% are rated “Good,” 64.8% “Fair,” and 1.6% “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
33.6%
43 of 128 rated 7-9
Fair condition
64.8%
83 of 128 rated 5-6
Poor condition
1.6%
2 of 128 rated 4 or below
In-state Poor-share rank
#11 of 77
Among Oklahoma counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 128 NBI-tracked bridges by lowest applicable component rating.
Good 33.6% (43)
Fair 64.8% (83)
Poor 1.6% (2)
Harper County's Poor-condition bridges carry 125 vehicle crossings a day
That is 0.2% of the county's reported daily bridge traffic on 1.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 63 crossings a day against 616 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 128 of 128 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
41.4% of Harper County's bridges have passed the 50-year mark
53 of the 128 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 33.6% 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 80% of the county's Poor-condition bridge traffic
FAS 3012 over CREEK, built 1987, carries 100 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 125 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Harper County's bridges were built
128 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1930s
1930–1939
27 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s 7
1950–1959
7 bridges
- 1960s 9
1960–1969
9 bridges
- 1970s 6
1970–1979
6 bridges
- 1980s
1980–1989
23 bridges
- 1990s
1990–1999
16 bridges
- 2000s
2000–2009
20 bridges
- 2010s 10
2010–2019
10 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1930s, when 27 of the county's bridges still in the inventory were built, which is 21.1% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year (1975) matches the Oklahoma average (1977).
How Harper County compares with Oklahoma's closest counties by inventory size
The 5 Oklahoma counties nearest Harper County in number of bridges, with their condition splits. Its 1.6% Poor share is the 2nd-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1975 is in line with the group.
Showing the 5 closest of 76 Oklahoma counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Coal County | 142 | 38.7% | 54.9% | 6.3% | 1974 |
| Adair County | 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 (this page) | 128 | 33.6% | 64.8% | 1.6% | 1975 |
| Nowata County | 126 | 44.4% | 42.9% | 12.7% | 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 Harper 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 Harper County, both outside Oklahoma so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside OK (128 bridges here).
- Custer County, ID · 128 bridges
- Franklin County, ME · 128 bridges
- Dillon County, SC · 128 bridges
- Cheatham County, TN · 128 bridges
Similar average build year
Nearest mean year-built outside OK (1975 here).
- San Bernardino County, CA · avg 1975 · 1,422 bridges
- Lane County, OR · avg 1975 · 1,010 bridges
- Fulton County, GA · avg 1975 · 775 bridges
- Westmoreland County, PA · avg 1975 · 620 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (83)
U.S. 283
FairOver: CREEK
2.5 MI N JCT US 64, Harper, OK
Built 1933 Load: 35.7 t ADT: 790
U.S. 283
FairOver: CREEK
5.1 MI N JCT US 64, Harper, OK
Built 1933 Load: 35.7 t ADT: 790
U.S. 64
FairOver: HUCKABY CREEK
9.5NE OF JCT US64W/US183, Harper, OK
Built 1934 Load: 36.0 t ADT: 820
N1950
FairOver: CREEK
.5S 4.5E 10.5S OF BUFFALO, Harper, OK
Built 2017 Load: 36.3 t ADT: 75
E0010
FairOver: CREEK
BORDER BRIDGE, Harper, OK
Built 1989 Load: 36.3 t ADT: 24
N1950
FairOver: CREEK
.5S 3W 5.5S OF SELMAN, Harper, OK
Built 2009 Load: 38.1 t ADT: 75
U.S. 64
FairOver: DAVIS CREEK
2.8NE OF JCT US64W/US183, Harper, OK
Built 1933 Load: 38.3 t ADT: 820
U.S. 270
FairOver: SAND CREEK
18 MI E BEAVER C/L, Harper, OK
Built 1987 Load: 40.8 t ADT: 3,100
U.S. 270
FairOver: OTTER CREEK
13.6 MI E BEAVER C/L, Harper, OK
Built 1987 Load: 40.8 t ADT: 3,000
N1840
FairOver: CREEK
10N; 7W; .1N OF BUFFALO, Harper, OK
Built 2008 Load: 40.8 t ADT: 100
U.S. 270
FairOver: CLEAR CREEK
8.5 MI E BEAVER C/L, Harper, OK
Built 1985 Load: 41.7 t ADT: 3,000
U.S. 270
FairOver: CLEAR CREEK OFLOW
8.7 MI E BEAVER C/L, Harper, OK
Built 1985 Load: 41.7 t ADT: 3,000
S.H. 34
FairOver: CREEK
5.4 MI N WOODWARD CO, Harper, OK
Built 1954 Load: 42.4 t ADT: 410
U.S. 64
FairOver: BUFFALO CREEK
1.6NE OF JCT US64W/US183, Harper, OK
Built 1995 Load: 42.6 t ADT: 1,500
S.H. 46
FairOver: BEAVER RIVER
0.4 MI N JCT US 270, Harper, OK
Built 1997 Load: 43.5 t ADT: 260
E0190
FairOver: BUFFALO CREEK TRIB.
6.5S 2.8W OF BUFFALO, Harper, OK
Built 1985 Load: 48.1 t ADT: 50
N1875
FairOver: CREEK
6.5S 2.3W OF BUFFALO, Harper, OK
Built 1986 Load: 48.1 t ADT: 100
N1950
FairOver: SAND CREEK
4.5E 8.1S of BUFFALO, Harper, OK
Built 2022 Load: 48.1 t ADT: 24
N1810
FairOver: REDOUBT CREEK
8N 10W .1S of BUFFALO, Harper, OK
Built 2022 Load: 48.1 t ADT: 24
E0130
FairOver: CREEK
.5S .8E OF BUFFALO, Harper, OK
Built 1979 Load: 49.0 t ADT: 100
N2020
FairOver: CREEK
30N2020E0080008, Harper, OK
Built 2009 Load: 49.0 t ADT: 100
N1907 (MAPLE ST.
FairOver: CREEK
2BLKS E. 0.3N 64 & 183, Harper, OK
Built 1975 Load: 52.6 t ADT: 200
U.S. 64
FairOver: COTTONWOOD CREEK
14.6NE OF JCT US64W/US183, Harper, OK
Built 1934 Load: 54.7 t ADT: 600
E0050
FairOver: CREEK
2.8W 2S 0.3W WILLARD, Harper, OK
Built 2009 Load: 55.3 t ADT: 100
E0050
FairOver: CREEK
6N; 3/4E OF 183/64 JCT, Harper, OK
Built 2010 Load: 55.3 t ADT: 24
E0070
FairOver: CREEK
5.8N 1.7E DOLBY SPRGS PK, Harper, OK
Built 2009 Load: 56.2 t ADT: 24
U.S. 64
FairOver: CREEK
2.2NE OF JCT US 64W/US183, Harper, OK
Built 1933 Load: 58.1 t ADT: 820
E0030
FairOver: SNAKE CREEK
9N 4.5W OF BUFFALO, Harper, OK
Built 1992 Load: 59.9 t ADT: 100
E0020
FairOver: CREEK
2.3E 1N .4E OF WILLARD, Harper, OK
Built 1987 Load: 59.9 t ADT: 45
S.H. 34
FairOver: CREEK
3.7 MI N WOODWARD CO, Harper, OK
Built 1954 Load: 65.4 t ADT: 420
E0242
FairOver: CREEK
4E 11.2S .5W OF BUFFALO, Harper, OK
Built 2017 Load: 68.9 t ADT: 100
E0060
FairOver: CREEK
5N 2.75W OF BUFFALO, Harper, OK
Built 2017 Load: 68.9 t ADT: 25
S.H. 34
FairOver: GILBERT CREEK
7.5 MI N WOODWARD CO, Harper, OK
Built 1954 Load: 86.3 t ADT: 410
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.