Total bridges
105
Public highway bridges in Calaveras County
County profile · official public datasets
Calaveras County, CA
105 public highway bridges tracked in the FHWA National Bridge Inventory: 33.3% rated Good, 60% Fair, 6.7% Poor.
- 105
- Public bridges
- 33.3%
- Good condition
- 6.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Calaveras County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 48%
- lowest Poor share in state
- 6.7%
- Poor-condition share
- 105
- public highway bridges
- 1962
- 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.
Calaveras County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Calaveras County ranks #28 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.7%). Calaveras County, California contains 105 public highway bridges. Roughly 33.3% are rated “Good,” 60% “Fair,” and 6.7% “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
33.3%
35 of 105 rated 7-9
Fair condition
60%
63 of 105 rated 5-6
Poor condition
6.7%
7 of 105 rated 4 or below
In-state Poor-share rank
#28 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 105 NBI-tracked bridges by lowest applicable component rating.
Good 33.3% (35)
Fair 60% (63)
Poor 6.7% (7)
Calaveras County's Poor-condition bridges carry 3,451 vehicle crossings a day
That is 1.5% of the county's reported daily bridge traffic on 6.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 493 crossings a day against 3,115 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 105 of 105 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
61.9% of Calaveras County's bridges have passed the 50-year mark
65 of the 105 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 33.3% 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 72.4% of the county's Poor-condition bridge traffic
STATE ROUTE 26 over INDIAN CREEK, built 1998, carries 2,500 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 3,451 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Calaveras County's bridges were built
105 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 5
1910–1919
5 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s
1930–1939
22 bridges
- 1940s
1940–1949
9 bridges
- 1950s 8
1950–1959
8 bridges
- 1960s
1960–1969
13 bridges
- 1970s 8
1970–1979
8 bridges
- 1980s
1980–1989
10 bridges
- 1990s
1990–1999
12 bridges
- 2000s
2000–2009
12 bridges
- 2010s 1
2010–2019
1 bridges
What this shows Construction peaked in the 1930s, when 22 of the county's bridges still in the inventory were built, which is 21% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1962, 8 years older than the California average of 1970.
How Calaveras County compares with California's closest counties by inventory size
The 5 California counties nearest Calaveras County in number of bridges, with their condition splits. Its 6.7% Poor share is the 2nd-lowest of these 6. Its average build year of 1962 against a peer-group mean of 1967 is 5 years older.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Sutter County | 121 | 33.9% | 52.9% | 13.2% | 1968 |
| Mariposa County | 109 | 21.1% | 67.9% | 11% | 1956 |
| Lassen County | 108 | 25.9% | 65.7% | 8.3% | 1968 |
| Calaveras County (this page) | 105 | 33.3% | 60% | 6.7% | 1962 |
| Del Norte County | 96 | 51% | 37.5% | 11.5% | 1975 |
| Modoc County | 87 | 49.4% | 49.4% | 1.1% | 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 Calaveras 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 Calaveras County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (105 bridges here).
- Bradley County, AR · 105 bridges
- Fulton County, AR · 105 bridges
- Izard County, AR · 105 bridges
- Flagler County, FL · 105 bridges
Similar average build year
Nearest mean year-built outside CA (1962 here).
- Berks County, PA · avg 1962 · 667 bridges
- Pecos County, TX · avg 1962 · 470 bridges
- Bristol County, MA · avg 1962 · 384 bridges
- Norfolk County, MA · avg 1962 · 343 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (35)
NO DATA ENTERED
GoodOver: BLUE CREEK
NO DATA ENTERED, Calaveras, CA
Built 2002 ADT: 50
STATE ROUTE 49
GoodOver: SIX MILE CREEK
10-CAL-049-6.51, Calaveras, CA
Built 1940 Load: 20.7 t ADT: 6,500
STATE ROUTE 49
GoodOver: SAN ANTONIO CREEK
10-CAL-049-14.09, Calaveras, CA
Built 1934 Load: 22.7 t ADT: 7,300
STATE ROUTE 49
GoodOver: SAN DOMINGO CREEK
10-CAL-049-12.51, Calaveras, CA
Built 1934 Load: 22.7 t ADT: 7,100
STATE ROUTE 49
GoodOver: CHEROKEE CREEK
10-CAL-049-9.01-ANG, Calaveras, CA
Built 1941 Load: 24.3 t ADT: 8,050
CALIFORNIA ST
GoodOver: SAN ANDREAS CREEK
0.05 MI W/O POPE ST, Calaveras, CA
Built 1953 Load: 24.3 t ADT: 395
STATE ROUTE 26
GoodOver: S. FORK MOKELUMNE RIVER
10-CAL-026-30.00, Calaveras, CA
Built 1936 Load: 29.8 t ADT: 750
STATE ROUTE 12
GoodOver: COSGROVE CREEK
10-CAL-012-10.32, Calaveras, CA
Built 1956 Load: 30.8 t ADT: 6,800
STATE ROUTE 49
GoodOver: CALAVERITAS CREEK
10-CAL-049-16.41, Calaveras, CA
Built 1930 Load: 31.8 t ADT: 7,300
STATE ROUTE 26
GoodOver: INDIAN CREEK
10-CAL-026-R4.31, Calaveras, CA
Built 1990 Load: 32.4 t ADT: 2,500
SB STATE ROUTE 26
GoodOver: HILLSIDE
10-CAL-026-29.33, Calaveras, CA
Built 1984 Load: 32.4 t ADT: 1,550
STATE ROUTE 26
GoodOver: M. FORK MOKELUMNE RIVER
10-CAL-026-R33.65, Calaveras, CA
Built 1997 Load: 32.4 t ADT: 1,825
STATE ROUTE 4
GoodOver: MURPHYS GRADE ROAD
10-CAL-004-R21.89, Calaveras, CA
Built 2009 Load: 32.4 t ADT: 9,150
STATE ROUTE 4
GoodOver: CREEK & PENSTOCK PIPE
10-CAL-004-R22.09, Calaveras, CA
Built 2009 Load: 32.4 t ADT: 7,900
STATE ROUTE 4
GoodOver: ANGELS CREEK
10-CAL-004-R22.80, Calaveras, CA
Built 2009 Load: 32.4 t ADT: 9,150
ROCK CREEK RD
GoodOver: ROCK CREEK
1.7 MI S/E MILTON RD, Calaveras, CA
Built 1990 Load: 32.4 t ADT: 37
MAIN STREET
GoodOver: COYOTE CREEK
0.7 MILES SOUTH OF RTE 4., Calaveras, CA
Built 2003 Load: 32.4 t ADT: 417
JESUS MARIA ROAD
GoodOver: NORTH FORK CALAVERAS RIV
2.4 MI S/E OF SR 26, Calaveras, CA
Built 1989 Load: 32.4 t ADT: 479
SHEEP RANCH RD
GoodOver: INDIAN CREEK
6 MI N OF MURPHYS, Calaveras, CA
Built 1989 Load: 32.4 t ADT: 161
POOLE STATION ROAD
GoodOver: CALAVERITAS CREEK
9.6 MI NORTH OF SR 4, Calaveras, CA
Built 2001 Load: 32.4 t ADT: 462
RAILROAD FLAT ROAD
GoodOver: MOKELUMNE RIVER
3.7 MILES SE OF SR 26, Calaveras, CA
Built 1999 Load: 32.4 t ADT: 700
DOGTOWN ROAD
GoodOver: SAN ANTONIO CREEK
9.2 ILES N/O SR 49, Calaveras, CA
Built 2001 Load: 32.4 t ADT: 100
BOOSTER WAY
GoodOver: ANGELS CREEK
0.1 MI W OF SR 4, Calaveras, CA
Built 1990 Load: 32.4 t ADT: 400
CREEKVIEW DRIVE
GoodOver: ANGELS CREEK
150FT N SR4 & BIG TREE DR, Calaveras, CA
Built 2009 Load: 32.4 t ADT: 400
RAILROAD FLAT ROAD
GoodOver: ESPERANZA CREEK
BETWN RDGE RD & JES MA RD, Calaveras, CA
Built 2018 Load: 32.4 t ADT: 800
SOUTHWORTH ROAD
GoodOver: BEAR CREEK
0.4 MI S OF ROUTE 12, Calaveras, CA
Built 2001 Load: 32.4 t ADT: 1,000
STATE ROUTE 49
GoodOver: MURRAY CREEK
10-CAL-049-R20.69, Calaveras, CA
Built 1963 Load: 32.7 t ADT: 5,900
GOLD STRIKE RD
GoodOver: MURRAY CREEK
1.7 MI SW/O SR 49, Calaveras, CA
Built 1949 Load: 34.3 t ADT: 1,364
BURSON RD
GoodOver: BEAR CREEK
1/4 MI S OF SR 12, Calaveras, CA
Built 1986 Load: 35.6 t ADT: 1,104
STATE ROUTE 4
GoodOver: SIX MILE CREEK
10-CAL-004-24.03, Calaveras, CA
Built 1961 Load: 39.2 t ADT: 6,950
PARROTTS FERRY RD
GoodOver: COYOTE CREEK
JUST SOUTH INTX WITH SR 4, Calaveras, CA
Built 1981 Load: 50.5 t ADT: 2,506
STATE ROUTE 26
GoodOver: INDIAN CREEK
10-CAL-026-2.46, Calaveras, CA
Built 1998 Load: 61.9 t ADT: 3,710
WINDING ROAD
GoodOver: NF STANISLAUS RIVER
NO DATA ENTERED, Calaveras, CA
Built 1999 Load: 73.5 t ADT: 50
SHEEP RANCH RD
GoodOver: SAN DOMINGO CREEK
2.4 MI N MURPHYS, Calaveras, CA
Built 1980 Load: 75.2 t ADT: 263
STATE ROUTE 4
GoodOver: CHEROKEE CREEK
10-CAL-004-R19.08, Calaveras, CA
Built 1989 Load: 99.9 t ADT: 5,900
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.