County profile · official public datasets

Dewey County, OK

169 public highway bridges tracked in the FHWA National Bridge Inventory: 86.4% rated Good, 13% Fair, 0.6% Poor.

169
Public bridges: 86.4%
Good condition: 0.6%
Poor condition

The verdict

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

Dewey County pairs a top-5% lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 5%
lowest Poor share in state: 0.6%
Poor-condition share: 169
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.

Dewey County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Dewey County ranks #4 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.6%). Dewey County, Oklahoma contains 169 public highway bridges. Roughly 86.4% are rated “Good,” 13% “Fair,” and 0.6% “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.

Total bridges

169

Public highway bridges in Dewey County

Good condition

86.4%

146 of 169 rated 7-9

Fair condition

13%

22 of 169 rated 5-6

Poor condition

0.6%

1 of 169 rated 4 or below

In-state Poor-share rank

#4 of 77

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

Condition distribution

Share of 169 NBI-tracked bridges by lowest applicable component rating.

Good

86.4% (146)

Fair

13% (22)

Poor

0.6% (1)

Dewey County's Poor-condition bridges carry 24 vehicle crossings a day

That is 0% of the county's reported daily bridge traffic on 0.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 24 crossings a day against 321 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 169 of 169 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

30.8% of Dewey County's bridges have passed the 50-year mark

52 of the 169 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 86.4% 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 100% of the county's Poor-condition bridge traffic

D0668 over GYP CREEK, built 1940, carries 24 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 24 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1930s

22
1940s

9
1950s

11
1960s

7
1970s

4
1980s

32
1990s

28
2000s

28
2010s

19
2020s

8

What this shows Construction peaked in the 1980s, when 32 of the county's bridges still in the inventory were built, which is 18.9% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1983, 6 years newer than the Oklahoma average of 1977.

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

The 5 Oklahoma counties nearest Dewey County in number of bridges, with their condition splits. Its 0.6% Poor share is the 1st-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1974 is 9 years newer.

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

Bridge inventory size and condition shares for Dewey County and the 5 Oklahoma counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Craig County	180	33.3%	47.2%	19.4%	1970
Pawnee County	174	46.6%	34.5%	19%	1975
Dewey County (this page)	169	86.4%	13%	0.6%	1983
Woodward County	168	36.3%	59.5%	4.2%	1980
Delaware County	160	34.4%	47.5%	18.1%	1975
Haskell County	155	36.8%	56.8%	6.5%	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 Dewey 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 Dewey County, both outside Oklahoma so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OK (169 bridges here).

Pike County, AL · 169 bridges
Laurens County, GA · 169 bridges
Cumberland County, IL · 169 bridges
Union County, IA · 169 bridges

Similar average build year

Nearest mean year-built outside OK (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 169 Good 146 Fair 22 Poor 1

Good-condition bridges (146)

Sort:

Dewey County Bridge Snapshot

Condition distribution

Dewey County's Poor-condition bridges carry 24 vehicle crossings a day

30.8% of Dewey County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (146)

FAS 2221

N2075

FAS 2206

N2070

FAS 2221

FAS 2224

FAS 2221

FAS 2224

FAS 2224

E0790

E0800

FAS 2221

E0820

E0590

U.S. 183

N2060

E0630

E0830

N2140

N2430

E0610

E0800

E0820

E0750

E0730

IRR E0595

IRR N2390

E0751

E0600 (INDIAN RD)

E0640

IRR E0600

IRR E0600

IRR E0600

IRR E0730

IRR N2290 FAS 2208

N2130

E0630

N2160

U.S. 270

E0770

N2170

U.S. 60

N2160

N2330

N2230

N2170

E0610

S.H. 47

FAS 2221

FAS 2223

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