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.

Total bridges

105

Public highway bridges in Calaveras County

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.

1900s

2
1910s

5
1920s

3
1930s

22
1940s

9
1950s

8
1960s

13
1970s

8
1980s

10
1990s

12
2000s

12
2010s

1

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.

Bridge inventory size and condition shares for Calaveras County and the 5 California counties closest to it in inventory size
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.

All 105 Good 35 Fair 63 Poor 7

Fair-condition bridges (63)

Sort:

Calaveras County Bridge Snapshot

Condition distribution

Calaveras County's Poor-condition bridges carry 3,451 vehicle crossings a day

61.9% of Calaveras County's bridges have passed the 50-year mark

One structure carries 72.4% of the county's Poor-condition bridge traffic

How Calaveras County compares with California's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (63)

WINDING ROAD

NO DATA ENTERED

MIDDLE BAR RD

DOGTOWN RD

DOGTOWN RD

LIME CREEK RD

STATE ROUTE 26

ROCK CREEK ROAD

LIME CREEK RD

MAIN ST

DOGTOWN RD

DOGTOWN RD

WARREN RD

WARREN RD

WARREN RD

EVERGREEN RD

PETTINGER RD

HOGAN DAM RD

MAIN ST

UTICA POWERHOUSE R

DOUBLE SPRINGS RD

STATE ROUTE 49

MONGE RANCH ROAD

STATE ROUTE 4

STATE ROUTE 12

HOGAN DAM RD

SHEEP RANCH RD

HOGAN DAM RD

SHEEP RANCH RD

STATE ROUTE 12

STATE ROUTE 4

HOGAN DAM ROAD

SHEEP RANCH RD

MILTON ROAD

MILTON RD

COPPER COVE DRIVE

OLIVE ORCHARD RD

SWISS RANCH RD

STATE ROUTE 4S

SAN DOMINGO ROAD

VISTA DEL LAGO DR

STATE ROUTE 49

STATE ROUTE 12

STATE ROUTE 4

STATE ROUTE 4

SCHADD ROAD

RAILROAD FLAT RD

SILVER RAPIDS RD

CAMANCHE PARKWAY

RAILROAD FLAT RD

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