Total bridges
106
Public highway bridges in Harmon County
County profile · official public datasets
Harmon County, OK
106 public highway bridges tracked in the FHWA National Bridge Inventory: 75.5% rated Good, 23.6% Fair, 0.9% Poor.
- 106
- Public bridges
- 75.5%
- Good condition
- 0.9%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Harmon County pairs a top-10% lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 8%
- lowest Poor share in state
- 0.9%
- Poor-condition share
- 106
- public highway bridges
- 1968
- 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.
Harmon County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Harmon County ranks #6 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.9%). Harmon County, Oklahoma contains 106 public highway bridges. Roughly 75.5% are rated “Good,” 23.6% “Fair,” and 0.9% “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
75.5%
80 of 106 rated 7-9
Fair condition
23.6%
25 of 106 rated 5-6
Poor condition
0.9%
1 of 106 rated 4 or below
In-state Poor-share rank
#6 of 77
Among Oklahoma counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 106 NBI-tracked bridges by lowest applicable component rating.
Good 75.5% (80)
Fair 23.6% (25)
Poor 0.9% (1)
Harmon County's Poor-condition bridges carry 60 vehicle crossings a day
That is 0.2% of the county's reported daily bridge traffic on 0.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 60 crossings a day against 307 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 106 of 106 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
51.9% of Harmon County's bridges have passed the 50-year mark
55 of the 106 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 75.5% 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 100% of the county's Poor-condition bridge traffic
2932C over WEST FORK SANDY CREEK, built 1982, carries 60 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 1-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 60 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Harmon County's bridges were built
106 bridges with a recorded construction year, grouped by decade
- 1920s 2
1920–1929
2 bridges
- 1930s
1930–1939
37 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s 2
1950–1959
2 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s 4
1970–1979
4 bridges
- 1980s 10
1980–1989
10 bridges
- 1990s 11
1990–1999
11 bridges
- 2000s
2000–2009
19 bridges
- 2010s 6
2010–2019
6 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1930s, when 37 of the county's bridges still in the inventory were built, which is 34.9% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1968, 9 years older than the Oklahoma average of 1977.
How Harmon County compares with Oklahoma's closest counties by inventory size
The 5 Oklahoma counties nearest Harmon County in number of bridges, with their condition splits. Its 0.9% Poor share is the 2nd-lowest of these 6. Its average build year of 1968 against a peer-group mean of 1975 is 7 years older.
Showing the 5 closest of 76 Oklahoma counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Murray County | 129 | 46.5% | 51.2% | 2.3% | 1976 |
| Harper County | 128 | 33.6% | 64.8% | 1.6% | 1975 |
| Nowata County | 126 | 44.4% | 42.9% | 12.7% | 1980 |
| Texas County | 111 | 40.5% | 58.6% | 0.9% | 1974 |
| Harmon County (this page) | 106 | 75.5% | 23.6% | 0.9% | 1968 |
| Cimarron County | 93 | 49.5% | 49.5% | 1.1% | 1972 |
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 Harmon 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 Harmon County, both outside Oklahoma so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside OK (106 bridges here).
- Ashley County, AR · 106 bridges
- Baca County, CO · 106 bridges
- Warren County, KY · 106 bridges
- Lincoln County, MN · 106 bridges
Similar average build year
Nearest mean year-built outside OK (1968 here).
- Montgomery County, PA · avg 1968 · 828 bridges
- San Joaquin County, CA · avg 1968 · 644 bridges
- Providence County, RI · avg 1968 · 476 bridges
- Imperial County, CA · avg 1968 · 444 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (106)
E1730
FairOver: CREEK
2.1 E 11.2 S OF GOULD, Harmon, OK
Built 1930 Load: 19.1 t ADT: 100
FAS 2908
FairOver: CREEK
6.0 S 1.5 W OF HOLLIS, Harmon, OK
Built 1930 Load: 19.1 t ADT: 40
N1720
FairOver: CREEK
2. N 1.5 E OF HOLLIS, Harmon, OK
Built 1937 Load: 19.1 t ADT: 70
FAS 2908
FairOver: CREEK
5.4 MI N OF US 60, Harmon, OK
Built 1936 Load: 19.1 t ADT: 50
N1700
FairOver: CREEK
4.1 N .5 W OF HOLLIS, Harmon, OK
Built 1937 Load: 19.1 t ADT: 60
N1810
FairOver: CREEK
2.1 E .2 S OF GOULD, Harmon, OK
Built 1937 Load: 19.1 t ADT: 50
E1700
FairOver: CREEK
1.3 E 8.2 S OF GOULD, Harmon, OK
Built 1937 Load: 19.1 t ADT: 60
FAS 2906
FairOver: CREEK
1.4 W 6. N OF HOLLIS, Harmon, OK
Built 1937 Load: 19.1 t ADT: 100
E1590
FairOver: CREEK
1.4 E 2. N OF HOLLIS, Harmon, OK
Built 1937 Load: 19.1 t ADT: 70
FAS 2908
FairOver: CREEK
4E 6.8S OF GOULD, Harmon, OK
Built 1937 Load: 19.1 t ADT: 75
E1570
FairOver: SANDY CREEK
4N .4W OF HOLLIS, Harmon, OK
Built 1937 Load: 19.1 t ADT: 70
2914C
FairOver: CREEK
3.0 S 0.2 E OF GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
E1700
FairOver: CREEK
2. E 8.2 S OF GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 60
E1560
FairOver: CREEK
1.6 W 6. N OF MC QUEEN, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
E1580
FairOver: CREEK
1. E 3. N OF HOLLIS, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
N1780
FairOver: CREEK
6.1 N .9 W OF GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
N1660
FairOver: CREEK
4.5 W .1 N OF HOLLIS, Harmon, OK
Built 1938 Load: 19.1 t ADT: 60
2928C
FairOver: CREEK
5.8 N OF GOULD, Harmon, OK
Built 1940 Load: 19.1 t ADT: 100
2928C
FairOver: CREEK
3.0 N OF GOULD, Harmon, OK
Built 1940 Load: 19.1 t ADT: 100
E1600
FairOver: CREEK
1.8 N 1.1 E OF GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
U.S. 62
FairOver: WEST FORK SANDY CREEK
0.3 MI E TEXAS ST. LINE, Harmon, OK
Built 1931 Load: 26.4 t ADT: 900
FAS 2908
FairOver: SANDY CREEK
7 MI S 2 MI W GOULD, Harmon, OK
Built 1994 Load: 28.1 t ADT: 60
FAS 2913
FairOver: LEBOS CREEK
1S OF US 62, Harmon, OK
Built 1983 Load: 29.9 t ADT: 100
S.H. 30
FairOver: EAST FORK SANDY CREEK
3.4 MI N. JCT. U.S. 62, Harmon, OK
Built 1974 Load: 37.2 t ADT: 410
U.S. 62
FairOver: EAST FORK SANDY CREEK
2.7 MI E JCT S.H. 30, Harmon, OK
Built 1931 Load: 40.8 t ADT: 1,800
FAS 2903
GoodOver: CREEK
5.8E N OF VINSON, Harmon, OK
Built 1920 Load: 19.1 t ADT: 50
E1560
GoodOver: CREEK
.6 W 5.8 N OF GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
2914C
GoodOver: CREEK
3.0 S 3.3 E GOULD, Harmon, OK
Built 1938 Load: 19.1 t ADT: 50
N1670
GoodOver: BUCK CREEK
3.6 W & 6.5 S OF HOLLIS, Harmon, OK
Built 2000 Load: 19.1 t ADT: 24
S.H. 30
GoodOver: CREEK
4.3 MI N JCT S.H. 9, Harmon, OK
Built 1946 Load: 19.6 t ADT: 210
U.S. 62
GoodOver: CREEK
1.2 MI E TEXAS ST. LINE, Harmon, OK
Built 1931 Load: 21.9 t ADT: 900
U.S. 62
GoodOver: CREEK
3.0 MI E TEXAS ST. LINE, Harmon, OK
Built 1931 Load: 24.5 t ADT: 900
S.H. 30
GoodOver: CREEK
0.1 MI N JCT U.S. 62, Harmon, OK
Built 1975 Load: 25.4 t ADT: 1,200
S.H. 30
GoodOver: CREEK
6.2 MI N JCT U.S. 62, Harmon, OK
Built 1974 Load: 25.9 t ADT: 410
E1630
GoodOver: SANDY CREEK
2S 2.8E OF HOLLIS, Harmon, OK
Built 2003 Load: 26.3 t ADT: 100
S.H. 5
GoodOver: CREEK
3.7 MI S JCT U.S. 62, Harmon, OK
Built 1952 Load: 26.6 t ADT: 250
S.H. 30
GoodOver: CREEK
7.4 MI N JCT S.H. 9, Harmon, OK
Built 1946 Load: 27.2 t ADT: 180
N1730
GoodOver: SANDY CREEK
1.8S 2.5E OF HOLLIS, Harmon, OK
Built 2004 Load: 28.1 t ADT: 100
U.S. 62
GoodOver: CREEK
1.7 MI W JCT S.H. 5, Harmon, OK
Built 1931 Load: 28.5 t ADT: 1,700
U.S. 62
GoodOver: CREEK
0.2 MI E JCT S.H. 30, Harmon, OK
Built 1927 Load: 28.7 t ADT: 2,300
U.S. 62
GoodOver: CREEK
2.5 MI W JCT S.H. 5, Harmon, OK
Built 1931 Load: 29.7 t ADT: 1,700
N1760
GoodOver: W. FORK SANDY CREEK
3.5S 2.9W OF GOULD, Harmon, OK
Built 2006 Load: 29.9 t ADT: 50
S.H. 30
GoodOver: CREEK
7.5 MI N JCT S.H. 9, Harmon, OK
Built 1946 Load: 30.3 t ADT: 180
E1730
GoodOver: CREEK
.8 E 11.2 S OF GOULD, Harmon, OK
Built 1989 Load: 30.8 t ADT: 100
N1740
GoodOver: EAST FORK SANDY CREEK
3E OF HOLLIS; .5S US62, Harmon, OK
Built 2004 Load: 30.8 t ADT: 100
S.H. 5
GoodOver: SANDY CREEK
3.3 MI N JACKSON C/L, Harmon, OK
Built 2014 Load: 30.8 t ADT: 250
S.H. 30
GoodOver: CREEK
0.2 MI N JCT U.S. 62, Harmon, OK
Built 1975 Load: 30.9 t ADT: 1,200
U.S. 62
GoodOver: CREEK
3.3 MI E JCT S.H. 30, Harmon, OK
Built 1931 Load: 32.7 t ADT: 1,700
S.H. 30
GoodOver: CREEK
1.7 MI S JCT S.H. 9, Harmon, OK
Built 1933 Load: 32.7 t ADT: 410
FAS 2913
GoodOver: CREEK
5.5S & E OF US 62, Harmon, OK
Built 1937 Load: 32.7 t ADT: 70
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.