County profile · official public datasets

Alfalfa County, OK

387 public highway bridges tracked in the FHWA National Bridge Inventory: 27.4% rated Good, 66.1% Fair, 6.5% Poor.

387
Public bridges
27.4%
Good condition
6.5%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Alfalfa County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

40th
of 77 on Poor share
6.5%
Poor-condition share
387
public highway bridges
1988
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.

Alfalfa County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Alfalfa County ranks #40 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.5%). Alfalfa County, Oklahoma contains 387 public highway bridges. Roughly 27.4% are rated “Good,” 66.1% “Fair,” and 6.5% “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

387

Public highway bridges in Alfalfa County

Good condition

27.4%

106 of 387 rated 7-9

Fair condition

66.1%

256 of 387 rated 5-6

Poor condition

6.5%

25 of 387 rated 4 or below

In-state Poor-share rank

#40 of 77

Among Oklahoma counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 387 NBI-tracked bridges by lowest applicable component rating.

Good
27.4% (106)
Fair
66.1% (256)
Poor
6.5% (25)

Alfalfa County's Poor-condition bridges carry 1,949 vehicle crossings a day

That is 1.4% of the county's reported daily bridge traffic on 6.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 78 crossings a day against 641 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 387 of 387 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

31.3% of Alfalfa County's bridges have passed the 50-year mark

121 of the 387 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 27.4% 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 6.2% of the county's Poor-condition bridge traffic

E0210 (0218C) over EAST CLAY CREEK, built 1999, carries 120 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 25-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,949 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Alfalfa County's bridges were built

387 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 109 of the county's bridges still in the inventory were built, which is 28.2% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1988, 11 years newer than the Oklahoma average of 1977.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Alfalfa County compares with Oklahoma's closest counties by inventory size

The 5 Oklahoma counties nearest Alfalfa County in number of bridges, with their condition splits. Its 6.5% Poor share is the 3rd-lowest of these 6. Its average build year of 1988 against a peer-group mean of 1978 is 10 years newer.

Showing the 5 closest of 76 Oklahoma counties eligible for comparison.

Bridge inventory size and condition shares for Alfalfa County and the 5 Oklahoma counties closest to it in inventory size
County Bridges Poor
Muskogee County 398 10.1%
Creek County 395 20.8%
Alfalfa County (this page) 387 6.5%
Custer County 384 1.3%
Payne County 384 10.4%
Stephens County 382 2.9%

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 Alfalfa 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 Alfalfa County, both outside Oklahoma so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OK (387 bridges here).

Similar average build year

Nearest mean year-built outside OK (1988 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 387 Good 106 Fair 256 Poor 25

Poor-condition bridges (25)

E0260

Poor

Over: WEST CLAY CREEK

4N 4.8E OF CARMEN, Alfalfa, OK

Built 1953 Load: 0.0 t ADT: 100

N2710 (FAS 0205)

Poor

Over: CREEK

1.5S OF JET, Alfalfa, OK

Built 1960 Load: 0.0 t ADT: 100

E0250

Poor

Over: SPRING CREEK TRIB.

1S 4.9W OF JET, Alfalfa, OK

Built 1957 Load: 2.7 t ADT: 100

N2620

Poor

Over: CREEK

3W 2.6N OF HELENA, Alfalfa, OK

Built 1955 Load: 4.5 t ADT: 25

E0110

Poor

Over: CREEK

.1E OF COUNTY LINE, Alfalfa, OK

Built 1938 Load: 5.4 t ADT: 100

N2540

Poor

Over: DRY CREEK

3.5W .6S OF BURLING, Alfalfa, OK

Built 1939 Load: 11.8 t ADT: 100

E0050

Poor

Over: SANDY CREEK OFLOW

1N 1.9E OF AMORITA, Alfalfa, OK

Built 1950 Load: 11.8 t ADT: 75

N2700

Poor

Over: TURKEY CREEK

2W .1S OF GOLTRY, Alfalfa, OK

Built 1936 Load: 14.5 t ADT: 100

E0260

Poor

Over: EAGLE CHIEF CREEK TRIB.

4N 3.9W OF CARMAN, Alfalfa, OK

Built 1946 Load: 15.4 t ADT: 100

N2520

Poor

Over: EAGLE CHIEF CREEK

3W .9S OF CARMEN, Alfalfa, OK

Built 1984 Load: 16.3 t ADT: 24

E0060

Poor

Over: CREEK

2N 2.3W OF SH 8/11 JCT, Alfalfa, OK

Built 1939 Load: 19.1 t ADT: 100

E0180 (FAS 0227)

Poor

Over: CREEK

2W OF OHIO ST, Alfalfa, OK

Built 1947 Load: 19.1 t ADT: 100

E0120 (FAS 0216)

Poor

Over: BIG SANDY OFLOW

10.7E OF SH 11, Alfalfa, OK

Built 1982 Load: 19.1 t ADT: 40

E0120 (FAS 0216)

Poor

Over: BIG SANDY CREEK

10.8 MI E OF SH 11, Alfalfa, OK

Built 1982 Load: 19.1 t ADT: 40

N2520 (FAS 0228)

Poor

Over: CREEK

3.3W OF 0238C, Alfalfa, OK

Built 1984 Load: 19.1 t ADT: 100

E0280 (FAS 0226)

Poor

Over: W FORK OF SPRING CREEK

4S 3.9W OF JET, Alfalfa, OK

Built 1986 Load: 19.1 t ADT: 100

E0360

Poor

Over: TURKEY CREEK TRIB.

3S .3E OF GOLTRY, Alfalfa, OK

Built 1938 Load: 23.6 t ADT: 100

E0050

Poor

Over: BARROW DRAIN

3N OF SH 8/11 JCT, Alfalfa, OK

Built 1996 Load: 24.5 t ADT: 100

N2570

Poor

Over: CREEK

4W .5S OF CHEROKEE, Alfalfa, OK

Built 1945 Load: 25.4 t ADT: 25

N2560 (FAS 0227)

Poor

Over: CREEK

1.2SW OF CHEROKEE, Alfalfa, OK

Built 2002 Load: 26.3 t ADT: 25

E0250

Poor

Over: CREEK

3W 1S OF JET, Alfalfa, OK

Built 2005 Load: 26.3 t ADT: 100

E0210 (0218C)

Poor

Over: EAST CLAY CREEK

7.2W 3N OF JET, Alfalfa, OK

Built 1999 Load: 28.1 t ADT: 120

N2570

Poor

Over: CREEK

4W .2S OF CHEROKEE, Alfalfa, OK

Built 2002 Load: 30.8 t ADT: 25

N2510

Poor

Over: CREEK

.9N 4.W OF CARMEN, Alfalfa, OK

Built 1994 Load: 32.7 t ADT: 50

E0140

Poor

Over: CREEK

6.8W 1N OF INGERSOLL, Alfalfa, OK

Built 1941 Load: 59.0 t ADT: 100

Read our methodology - how this data is sourced, computed, and verified.

Related

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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.