Total bridges
1,117
Public highway bridges in Riverside County
County profile · official public datasets
Riverside County, CA
1,117 public highway bridges tracked in the FHWA National Bridge Inventory: 56.4% rated Good, 41.2% Fair, 2.4% Poor.
- 1,117
- Public bridges
- 56.4%
- Good condition
- 2.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Riverside 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 3%
- lowest Poor share in state
- 2.4%
- Poor-condition share
- 1,117
- public highway bridges
- 1977
- 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.
Riverside County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Riverside County ranks #2 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.4%). Riverside County, California contains 1,117 public highway bridges. Roughly 56.4% are rated “Good,” 41.2% “Fair,” and 2.4% “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
56.4%
630 of 1,117 rated 7-9
Fair condition
41.2%
460 of 1,117 rated 5-6
Poor condition
2.4%
27 of 1,117 rated 4 or below
In-state Poor-share rank
#2 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 1,117 NBI-tracked bridges by lowest applicable component rating.
Good 56.4% (630)
Fair 41.2% (460)
Poor 2.4% (27)
Riverside County's Poor-condition bridges carry 338,216 vehicle crossings a day
That is 0.9% of the county's reported daily bridge traffic on 2.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 12,527 crossings a day against 33,065 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 1,117 of 1,117 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
49.8% of Riverside County's bridges have passed the 50-year mark
556 of the 1,117 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 56.4% 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 10.4% of the county's Poor-condition bridge traffic
RAMON ROAD over WHITEWATER RIVER, built 1982, carries 35,273 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 27-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 338,216 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Riverside County's bridges were built
1,117 bridges with a recorded construction year, grouped by decade
- 1920s 11
1920–1929
11 bridges
- 1930s 34
1930–1939
34 bridges
- 1940s 31
1940–1949
31 bridges
- 1950s 89
1950–1959
89 bridges
- 1960s
1960–1969
318 bridges
- 1970s
1970–1979
173 bridges
- 1980s
1980–1989
166 bridges
- 1990s
1990–1999
130 bridges
- 2000s 92
2000–2009
92 bridges
- 2010s 69
2010–2019
69 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1960s, when 318 of the county's bridges still in the inventory were built, which is 28.5% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1977, 7 years newer than the California average of 1970.
How Riverside County compares with California's closest counties by inventory size
The 5 California counties nearest Riverside County in number of bridges, with their condition splits. Its 2.4% Poor share is the 1st-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1973 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| San Bernardino County | 1,422 | 41.9% | 52.1% | 6% | 1975 |
| Orange County | 1,164 | 53.2% | 43.8% | 3% | 1978 |
| Riverside County (this page) | 1,117 | 56.4% | 41.2% | 2.4% | 1977 |
| Santa Clara County | 964 | 38.3% | 56.1% | 5.6% | 1972 |
| Fresno County | 916 | 38.9% | 57.3% | 3.8% | 1969 |
| Sacramento County | 740 | 50.9% | 45.7% | 3.4% | 1973 |
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 Riverside 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 Riverside County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (1,117 bridges here).
- Collin County, TX · 1,127 bridges
- Tulsa County, OK · 1,135 bridges
- Clark County, NV · 1,141 bridges
- Pima County, AZ · 1,150 bridges
Similar average build year
Nearest mean year-built outside CA (1977 here).
- King County, WA · avg 1977 · 1,238 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
- Chautauqua County, NY · avg 1977 · 559 bridges
- St. Clair County, IL · avg 1977 · 486 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (1,117)
GRAPEFRUIT BLVD
PoorOver: WHITEWATER RIVER
0.9 MI S/AIRPORT BLVD, Riverside, CA
Built 1970 Load: 26.2 t ADT: 5,074
INDIAN CANYON DRIV
PoorOver: UP RR & AMTRAK
0.6 MI. S/O RTE. I-10 FWY, Riverside, CA
Built 1953 Load: 29.5 t ADT: 15,979
STATE ROUTE 86 SB
PoorOver: OTAN DITCH
08-RIV-086-0.99, Riverside, CA
Built 1989 Load: 31.1 t ADT: 15,300
STATE ROUTE 86 SB
PoorOver: MEMEL DITCH
08-RIV-086-1.58, Riverside, CA
Built 1989 Load: 32.4 t ADT: 15,300
STATE ROUTE 86 SB
PoorOver: COPHY DITCH
08-RIV-086-1.38, Riverside, CA
Built 1989 Load: 32.4 t ADT: 15,300
Route 74
PoorOver: LAKE ELSINORE OUTLT CHNL
08-RIV-074-R15.36-ESN, Riverside, CA
Built 1994 Load: 32.4 t ADT: 29,580
JEFFERSON AVENUE
PoorOver: SANTA GERTRUDIS CREEK
0.2 MI. NW/O WINCHSTR RD, Riverside, CA
Built 1990 Load: 32.4 t ADT: 22,000
RAMON ROAD
PoorOver: WHITEWATER RIVER
0.8 MI. E/O GENE AUTRY TR, Riverside, CA
Built 1982 Load: 32.4 t ADT: 35,273
MURRIETA ROAD
PoorOver: SALT CREEK CHANNEL
0.6 MI. N/O NEWPORT ROAD, Riverside, CA
Built 1981 Load: 32.4 t ADT: 14,000
INTERSTATE 10 WB
PoorOver: THOUSAND PALMS WASH
08-RIV-010-R53.80-IND, Riverside, CA
Built 1972 Load: 35.0 t ADT: 33,000
INTERSTATE 10 EB
PoorOver: THOUSAND PALMS WASH
08-RIV-010-R53.80-IND, Riverside, CA
Built 1972 Load: 36.0 t ADT: 33,000
INTERSTATE 10 EB
PoorOver: PINTO GULCH
08-RIV-010-R82.59, Riverside, CA
Built 1965 Load: 37.9 t ADT: 11,250
AUBURNDALE STREET
PoorOver: TEMESCAL CREEK
0.2 MI. N/O RINCON STREET, Riverside, CA
Built 1981 Load: 39.9 t ADT: 4,000
RAILROAD AVENUE
PoorOver: WEST CHANNEL STUBBE WASH
0.3 MI. W/O VERBENIA AVE., Riverside, CA
Built 1983 Load: 44.1 t ADT: 240
STATE ROUTE 86 NB
PoorOver: COPHY DITCH
08-RIV-086-1.39, Riverside, CA
Built 1979 Load: 44.7 t ADT: 15,300
STATE ROUTE 86 NB
PoorOver: MEMEL DITCH
08-RIV-086-1.58, Riverside, CA
Built 1979 Load: 54.4 t ADT: 15,300
MONROE STREET
PoorOver: WHITEWATER RIVER
0.1 MI. S/O RTE. I-10 FWY, Riverside, CA
Built 1972 Load: 69.3 t ADT: 22,400
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.