Total bridges
165
Public highway bridges in Plumas County
County profile · official public datasets
Plumas County, CA
165 public highway bridges tracked in the FHWA National Bridge Inventory: 26.7% rated Good, 69.1% Fair, 4.2% Poor.
- 165
- Public bridges
- 26.7%
- Good condition
- 4.2%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Plumas County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 22%
- lowest Poor share in state
- 4.2%
- Poor-condition share
- 165
- public highway bridges
- 1965
- 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.
Plumas County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Plumas County ranks #13 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.2%). Plumas County, California contains 165 public highway bridges. Roughly 26.7% are rated “Good,” 69.1% “Fair,” and 4.2% “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
26.7%
44 of 165 rated 7-9
Fair condition
69.1%
114 of 165 rated 5-6
Poor condition
4.2%
7 of 165 rated 4 or below
In-state Poor-share rank
#13 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 165 NBI-tracked bridges by lowest applicable component rating.
Good 26.7% (44)
Fair 69.1% (114)
Poor 4.2% (7)
Plumas County's Poor-condition bridges carry 10,336 vehicle crossings a day
That is 8.3% of the county's reported daily bridge traffic on 4.2% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,477 crossings a day against 1,176 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 165 of 165 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
73.9% of Plumas County's bridges have passed the 50-year mark
122 of the 165 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 26.7% 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 97.2% of the county's Poor-condition bridge traffic
GULLING STREET over MIDDLE FORK FEATHER RIV, built 1954, carries 10,046 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 7-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 10,336 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Plumas County's bridges were built
165 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 4
1910–1919
4 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 12
1930–1939
12 bridges
- 1940s 9
1940–1949
9 bridges
- 1950s
1950–1959
41 bridges
- 1960s
1960–1969
46 bridges
- 1970s 15
1970–1979
15 bridges
- 1980s 16
1980–1989
16 bridges
- 1990s 3
1990–1999
3 bridges
- 2000s 6
2000–2009
6 bridges
- 2010s 8
2010–2019
8 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1960s, when 46 of the county's bridges still in the inventory were built, which is 27.9% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1965, 5 years older than the California average of 1970.
How Plumas County compares with California's closest counties by inventory size
The 5 California counties nearest Plumas County in number of bridges, with their condition splits. Its 4.2% Poor share is the 1st-lowest of these 6. Its average build year of 1965 against a peer-group mean of 1967 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| El Dorado County | 192 | 46.9% | 46.9% | 6.3% | 1975 |
| Santa Cruz County | 192 | 40.1% | 42.2% | 17.7% | 1963 |
| Kings County | 168 | 40.5% | 53.6% | 6% | 1968 |
| Plumas County (this page) | 165 | 26.7% | 69.1% | 4.2% | 1965 |
| Napa County | 158 | 45.6% | 50% | 4.4% | 1961 |
| San Francisco County | 143 | 34.3% | 51% | 14.7% | 1969 |
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 Plumas 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 Plumas County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (165 bridges here).
- Cleburne County, AL · 165 bridges
- Randolph County, AL · 165 bridges
- Leon County, FL · 165 bridges
- Hamilton County, IL · 165 bridges
Similar average build year
Nearest mean year-built outside CA (1965 here).
- Windsor County, VT · avg 1965 · 483 bridges
- Bedford County, PA · avg 1965 · 417 bridges
- Crawford County, PA · avg 1965 · 399 bridges
- Harper County, KS · avg 1965 · 372 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (114)
NO DATA ENTERED
FairOver: BIG GRIZZLY CREEK
NO DATA ENTERED, Plumas, CA
Built 1974 ADT: 50
ROAD 24N05
FairOver: RED CLOVER CREEK
NO DATA ENTERED, Plumas, CA
Built 1954 ADT: 50
ROAD 22N10
FairOver: GRAY EAGLE CREEK
GRAY EAGLE LODGE, Plumas, CA
Built 1977 ADT: 50
ROAD 23N10
FairOver: POPLAR CREEK
POPLAR CREEK NEAR SLOAT, Plumas, CA
Built 1975 ADT: 50
ROAD 23N08
FairOver: TRIBUTARY TO JAMISON CR
NO DATA ENTERED, Plumas, CA
Built 1976 ADT: 50
ROAD 27N24Y
FairOver: INDIAN CREEK
CAMPGROUND - ANTELOPE LK, Plumas, CA
Built 1967 ADT: 50
ROAD 22N25
FairOver: PINCHARD CREEK
NO DATA ENTERED, Plumas, CA
Built 1949 ADT: 50
ROAD 23N10
FairOver: UPPER HOPKINS CREEK
NO DATA ENTERED, Plumas, CA
Built 1984 ADT: 50
ROAD 22N22
FairOver: LAVA CREEK
NO DATA ENTERED, Plumas, CA
Built 1971 ADT: 50
ROAD 22N43Y
FairOver: LOWER HOPKINS CREEK
NO DATA ENTERED, Plumas, CA
Built 1984 ADT: 5
ROAD 22N57
FairOver: BLACK ROCK CREEK
NO DATA ENTERED, Plumas, CA
Built 1981 ADT: 50
ROAD 22N57
FairOver: SO FORK FEATHER RIVER
NO DATA ENTERED, Plumas, CA
Built 1960 ADT: 40
ROAD 23N15
FairOver: LITTLE NORTH FORK/CG
NO DATA ENTERED, Plumas, CA
Built 1953 ADT: 50
ROAD 23N18
FairOver: TOLAND CREEK
NO DATA ENTERED, Plumas, CA
Built 1974 ADT: 50
ROAD 23N18
FairOver: COLDWATER CREEK
AT ARKANSAS RAVINE, Plumas, CA
Built 1960 ADT: 50
ROAD 23N68
FairOver: SO FORK ROCK CREEK
NO DATA ENTERED, Plumas, CA
Built 1966 ADT: 50
ROAD 24N29
FairOver: MEADOW VALLEY CREEK
MEADOW VALLEY CREEK, Plumas, CA
Built 1966 ADT: 50
DYSON LANE
FairOver: MID FK FEATHER RIV OVRFL
2.4 MI E BCKWRTH-CALPN RD, Plumas, CA
Built 1908 Load: 6.8 t ADT: 40
PORT WINE ROAD
FairOver: SLATE CREEK
2.1 MI SE/O QUIN-LAPOR R, Plumas, CA
Built 1910 Load: 7.5 t ADT: 50
CAMPGROUND RD
FairOver: JAMISON CREEK
PLUMAS-EUREKA STATE PARK, Plumas, CA
Built 1963 Load: 12.0 t ADT: 275
BUCKS LAKE ROAD
FairOver: BIG GRIZZLEY CREEK
1.7MI W BUCKS LAKE DAM RD, Plumas, CA
Built 2011 Load: 12.6 t ADT: 350
RICH BAR RD
FairOver: E BR N FK FEATHER RIVER
0.3 MI S OF SH 70, Plumas, CA
Built 1932 Load: 13.9 t ADT: 10
CAMP LAYMAN ROAD
FairOver: MIDDLE FORK FEATHER RIV
0.2 MI SOUTH OF SR 70, Plumas, CA
Built 1938 Load: 15.2 t ADT: 35
GOPHER HILL LDFL R
FairOver: SPANISH CREEK
200FT N/O BUCKS LAKE RD, Plumas, CA
Built 1969 Load: 16.2 t ADT: 120
BUTT RESERVOIR RD
FairOver: BUTT RESERVOIR SPILLWAY
9.3 MI SOUTH OF SR 89, Plumas, CA
Built 1940 Load: 16.5 t ADT: 80
BIG SPRINGS RD/A13
FairOver: HAMILTON BRANCH CREEK
0.1 MI WEST OF SR 147, Plumas, CA
Built 1955 Load: 16.8 t ADT: 1,300
BLARSDEN GRAGLE RD
FairOver: MIDDLE FORK FEATHER RIV
0.5 MI NORTH OF S.H.89, Plumas, CA
Built 1910 Load: 16.8 t ADT: 370
SLOAT-POPLAR VLY R
FairOver: MIDDLE FORK FEATHER RIV
AT SLOAT RD, Plumas, CA
Built 1959 Load: 16.8 t ADT: 140
DIAMOND MTN RD
FairOver: COOKS CREEK
3.6 MI NE BCKWTH GRNVLE R, Plumas, CA
Built 1950 Load: 17.2 t ADT: 240
SCHNEIDER CR RD
FairOver: MEADOW VALLEY CREEK
0.3 MI S OF BUCKS LAKE RD, Plumas, CA
Built 1968 Load: 17.2 t ADT: 120
KEDDIE RESORT ROAD
FairOver: SPANISH CREEK
AT SR 70, Plumas, CA
Built 1914 Load: 17.8 t ADT: 140
WARNER VALLEY RD
FairOver: WARNER CREEK
13.4 MI NW SH36, Plumas, CA
Built 1965 Load: 18.5 t ADT: 90
GRNVILE WOLF CK RD
FairOver: WOLF CREEK
150 FT SOUTH OF SH 89, Plumas, CA
Built 1961 Load: 18.8 t ADT: 10
NELSON ST
FairOver: INDIAN CREEK
1.0 MI N ARLINGTON RD, Plumas, CA
Built 1941 Load: 19.1 t ADT: 280
RAILROAD STREET
FairOver: ESTRAY CREEK
0.2 MI SW SH 70, Plumas, CA
Built 1984 Load: 19.1 t ADT: 50
ROAD 23N37
FairOver: JAMISON CREEK
JAMISON CREEK, Plumas, CA
Built 1952 Load: 19.8 t ADT: 50
ROAD 22N94
FairOver: CASCADE CREEK
NO DATA ENTERED, Plumas, CA
Built 1966 Load: 20.1 t ADT: 60
OAKLAND CAMP ROAD
FairOver: SPANISH CREEK
4.3 MI N/O RTE 70, Plumas, CA
Built 1920 Load: 21.4 t ADT: 130
ROAD 23N18
FairOver: LITTLE NO FORK G BASIN
GRANITE BASIN, Plumas, CA
Built 1973 Load: 21.4 t ADT: 50
STATE ROUTE 70
FairOver: NORTH FORK FEATHER RIVER
02-PLU-070-16.54, Plumas, CA
Built 1934 Load: 21.7 t ADT: 1,345
BELDEN TOWN ROAD
FairOver: NORTH FORK FEATHER RIVER
0.01 MI SOUTH OF SR 70, Plumas, CA
Built 1912 Load: 23.3 t ADT: 170
STATE ROUTE 36
FairOver: NORTH FORK FEATHER RIVER
02-PLU-036-8.84, Plumas, CA
Built 1966 Load: 23.7 t ADT: 5,500
STATE ROUTE 70
FairOver: SPANISH CREEK
02-PLU-070-42.45, Plumas, CA
Built 1964 Load: 24.0 t ADT: 6,700
ROCKY POINT ROAD
FairOver: BIG GRIZZLY CREEK
0.5 MI S SH 70, Plumas, CA
Built 1962 Load: 24.0 t ADT: 130
GOLD LAKE FOR HWY
FairOver: FRAZIER CREEK
1.1 MI SE/O SH 89, Plumas, CA
Built 1967 Load: 24.0 t ADT: 620
STATE ROUTE 70
FairOver: NORTH FORK FEATHER RIVER
02-PLU-070-6.99, Plumas, CA
Built 1936 Load: 24.3 t ADT: 1,345
STATE ROUTE 70
FairOver: GREENHORN CREEK
02-PLU-070-47.74, Plumas, CA
Built 1941 Load: 24.3 t ADT: 3,425
HARRIET LN
FairOver: MID FK FEATHER RIV OVRFL
1.4 MI S DYSON LN, Plumas, CA
Built 1963 Load: 24.3 t ADT: 125
N ARM ESIDE RD
FairOver: PETERS CREEK
3.8 MI NE OF BECKWRTH-GRD, Plumas, CA
Built 1955 Load: 24.3 t ADT: 100
STATE ROUTE 70
FairOver: BIG GRIZZLY CREEK
02-PLU-070-R78.64, Plumas, CA
Built 1969 Load: 24.6 t ADT: 3,400
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.