Total bridges
306
Public highway bridges in La Paz County
County profile · official public datasets
La Paz County, AZ
306 public highway bridges tracked in the FHWA National Bridge Inventory: 64.1% rated Good, 32.4% Fair, 3.6% Poor.
- 306
- Public bridges
- 64.1%
- Good condition
- 3.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
La Paz 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.
- 12th
- of 15 on Poor share
- 3.6%
- Poor-condition share
- 306
- public highway bridges
- 1961
- 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.
La Paz County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, La Paz County ranks #12 of 15 Arizona counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.6%). La Paz County, Arizona contains 306 public highway bridges. Roughly 64.1% are rated “Good,” 32.4% “Fair,” and 3.6% “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
64.1%
196 of 306 rated 7-9
Fair condition
32.4%
99 of 306 rated 5-6
Poor condition
3.6%
11 of 306 rated 4 or below
In-state Poor-share rank
#12 of 15
Among Arizona counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 306 NBI-tracked bridges by lowest applicable component rating.
Good 64.1% (196)
Fair 32.4% (99)
Poor 3.6% (11)
La Paz County's Poor-condition bridges carry 6,403 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 3.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 582 crossings a day against 8,997 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 306 of 306 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
84% of La Paz County's bridges have passed the 50-year mark
257 of the 306 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 64.1% 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 46.9% of the county's Poor-condition bridge traffic
IRR BIA RTE 1 over MAIN DRAIN, built 1962, carries 3,000 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 11-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 6,403 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When La Paz County's bridges were built
306 bridges with a recorded construction year, grouped by decade
- 1930s
1930–1939
67 bridges
- 1940s 6
1940–1949
6 bridges
- 1950s 34
1950–1959
34 bridges
- 1960s
1960–1969
121 bridges
- 1970s 36
1970–1979
36 bridges
- 1980s 29
1980–1989
29 bridges
- 1990s 1
1990–1999
1 bridges
- 2000s 9
2000–2009
9 bridges
- 2010s 2
2010–2019
2 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1960s, when 121 of the county's bridges still in the inventory were built, which is 39.5% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1961, 16 years older than the Arizona average of 1977.
How La Paz County compares with Arizona's closest counties by inventory size
The 5 Arizona counties nearest La Paz County in number of bridges, with their condition splits. Its 3.6% Poor share is the 5th-lowest of these 6. Its average build year of 1961 against a peer-group mean of 1972 is 11 years older.
Showing the 5 closest of 14 Arizona counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Coconino County | 405 | 51.9% | 46.9% | 1.2% | 1969 |
| La Paz County (this page) | 306 | 64.1% | 32.4% | 3.6% | 1961 |
| Navajo County | 277 | 52.7% | 45.1% | 2.2% | 1972 |
| Yuma County | 262 | 50.4% | 47.7% | 1.9% | 1973 |
| Apache County | 259 | 48.3% | 45.9% | 5.8% | 1973 |
| Gila County | 259 | 60.2% | 37.5% | 2.3% | 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 La Paz 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 La Paz County, both outside Arizona so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside AZ (306 bridges here).
- Adair County, IA · 306 bridges
- Greene County, PA · 306 bridges
- Greene County, TN · 306 bridges
- Grant County, WA · 306 bridges
Similar average build year
Nearest mean year-built outside AZ (1961 here).
- Westchester County, NY · avg 1961 · 774 bridges
- Tehama County, CA · avg 1961 · 450 bridges
- Berkshire County, MA · avg 1961 · 450 bridges
- Schuylkill County, PA · avg 1961 · 368 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (99)
IRR BIA RTE 21
FairOver: MAIN DRAIN 17TH AVENUE
0.3 KM S OF BIA RTE 21/34, La Paz, AZ
Built 1969 Load: 21.1 t ADT: 90
IRR BIA RTE 50
FairOver: MAIN DRAIN
1.7 KM WEST OF BIA 1, La Paz, AZ
Built 1968 Load: 21.7 t ADT: 110
US 60
FairOver: Wash
15.3 mi E Jct SR 72, La Paz, AZ
Built 1954 Load: 21.8 t ADT: 1,922
US 60
FairOver: Wash
1.0 mi E Jct SR 72, La Paz, AZ
Built 1956 Load: 21.8 t ADT: 2,303
IRR BIA ROUTE 1
FairOver: TYSON WATERWAY
1.6 KM S OF BIA 1/56 INT., La Paz, AZ
Built 1958 Load: 22.0 t ADT: 1,700
US 60
FairOver: Wash
3.2 mi E Jct I-10, La Paz, AZ
Built 1932 Load: 22.7 t ADT: 1,200
US 60
FairOver: Dry Wash
14.3 mi W Jct SR 71, La Paz, AZ
Built 1962 Load: 24.5 t ADT: 1,922
US 60
FairOver: Salome Wash
7.0 mi E Jct SR 72, La Paz, AZ
Built 1941 Load: 25.4 t ADT: 1,922
Levee Road
FairOver: Colorado River & Svc. Rd
35 miles South of I-10, La Paz, AZ
Built 1960 Load: 25.4 t ADT: 107
IRR BIA RTE 50
FairOver: USBR MAIN DRAIN
4 KM WEST OF BIA 1, La Paz, AZ
Built 1954 Load: 25.9 t ADT: 30
IRR BIA RTE 60
FairOver: USBR DRAIN
3.2 KM WEST OF BIA 1, La Paz, AZ
Built 1953 Load: 25.9 t ADT: 65
US 60
FairOver: Wash
4.3 mi E Jct I-10, La Paz, AZ
Built 1932 Load: 26.3 t ADT: 1,200
US 60
FairOver: Wash
4.2 mi E Jct I-10, La Paz, AZ
Built 1932 Load: 27.2 t ADT: 1,200
US 60
FairOver: Dry Wash
8.7 mi E Jct SR 72, La Paz, AZ
Built 1954 Load: 27.2 t ADT: 2,156
Plomosa Road
FairOver: Bouse Wash
0.5 West of SR 72, La Paz, AZ
Built 1993 Load: 27.2 t ADT: 363
US 60
FairOver: Dry Wash
4.8 mi E Jct SR 72, La Paz, AZ
Built 1932 Load: 28.1 t ADT: 2,303
IRR BIA RTE 1
FairOver: EAST DRAIN DITCH
1.6 KM S OF BIA RTE 1/18, La Paz, AZ
Built 1962 Load: 28.5 t ADT: 2,800
IRR BIA RTE 1
FairOver: MESA DRAIN
1.2 KM N OF BIA RTE 1/56, La Paz, AZ
Built 1953 Load: 29.0 t ADT: 1,656
US 60
FairOver: Dry Wash
5.7 mi E Jct SR 72, La Paz, AZ
Built 1932 Load: 29.0 t ADT: 2,303
US 60
FairOver: Dry Wash
8.0 mi East Jct SR 72, La Paz, AZ
Built 1954 Load: 29.0 t ADT: 2,216
I 10; EB
FairOver: La Cholla Wash
2.7 mi W Jct US 95, La Paz, AZ
Built 1953 Load: 29.0 t ADT: 8,314
US 60
FairOver: Wash
8.2 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
8.1 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
8.0 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
7.8 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,451
US 60
FairOver: Wash
7.7 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
7.6 mi West of Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
7.5 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
7.3 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
7.2 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 29.9 t ADT: 1,373
US 60
FairOver: Wash
15.5 mi W Jct SR 71, La Paz, AZ
Built 1934 Load: 29.9 t ADT: 1,673
US 60
FairOver: Wash
10.0 mi East of Jct I 10, La Paz, AZ
Built 1932 Load: 31.8 t ADT: 1,373
US 60
FairOver: Wash
3.2 mi W Jct SR 72, La Paz, AZ
Built 1932 Load: 31.8 t ADT: 1,220
US 60
FairOver: Wash
12.5 mi W Jct SR 71, La Paz, AZ
Built 1934 Load: 31.8 t ADT: 1,494
Parker Dam Road
FairOver: Colorado River
6 m NE of Parker AZ, La Paz, AZ
Built 1934 Load: 32.3 t ADT: 360
Parker Dam Road
FairOver: Colorado River
6 m NE of Parker AZ, La Paz, AZ
Built 1934 Load: 32.3 t ADT: 360
Parker Dam Road
FairOver: Colorado River
6 m NE of Parker AZ, La Paz, AZ
Built 1934 Load: 32.3 t ADT: 360
IRR BIA RTE 1
FairOver: MAIN IRRIGATION CANAL
3.5 KM W OF AZ HWY 95, La Paz, AZ
Built 1962 Load: 32.4 t ADT: 3,895
IRR BIA RTE 10
FairOver: MAIN DRAIN
1.6 KM WEST OF BIA 1, La Paz, AZ
Built 1953 Load: 32.6 t ADT: 75
IRR BIA RTE 119
FairOver: WEST WAY DRAIN
0.8 KM E OF BIA 21/24 JCT, La Paz, AZ
Built 1969 Load: 32.6 t ADT: 100
IRR BIA RTE 27
FairOver: WEST DRAIN
MIDWY BETWN BIA RTS 27/30, La Paz, AZ
Built 1953 Load: 32.6 t ADT: 89
IRR BIA RTE 34
FairOver: WEST DRAIN
7.9 KM EAST OF BIA 1, La Paz, AZ
Built 1953 Load: 32.6 t ADT: 30
IRR BIA 44
FairOver: USBR DRAIN
6.3 KM W OF BIA 1, La Paz, AZ
Built 1953 Load: 32.6 t ADT: 40
IRR BIA RTE 38
FairOver: FIRST FEEDER NO 7 DRAIN
1.7 KM EAST OF BIA 1, La Paz, AZ
Built 1953 Load: 32.6 t ADT: 175
IRR BIA RTE 117
FairOver: SECOND FEEDER DRAIN
0.5 KM SOUTH OF BIA 38, La Paz, AZ
Built 1955 Load: 32.6 t ADT: 112
BIA IRR RTE 24
FairOver: IRRIGATION CANAL
4 KM EAST OF POSTON, La Paz, AZ
Built 1980 Load: 32.6 t ADT: 40
IRR BIA RTE 4
FairOver: MAIN CANAL
2.1 KM WEST OF BIA 3, La Paz, AZ
Built 1982 Load: 32.7 t ADT: 400
Tom Wells Rd
FairOver: I 10
13.1 mi W Jct US 95, La Paz, AZ
Built 1963 Load: 32.7 t ADT: 2,036
Gold Nugget Mine
FairOver: I-10
4.6 mi W Jct US 60, La Paz, AZ
Built 1963 Load: 32.7 t ADT: 68
IRR SR 95
FairOver: Bouse Wash
0.4 mi South of Jct SR 72, La Paz, AZ
Built 1970 Load: 32.7 t ADT: 4,250
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.