Total bridges
61
Public highway bridges in Amador County
County profile · official public datasets
Amador County, CA
61 public highway bridges tracked in the FHWA National Bridge Inventory: 37.7% rated Good, 37.7% Fair, 24.6% Poor.
- 61
- Public bridges
- 37.7%
- Good condition
- 24.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Amador County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- 58th
- of 58 on Poor share
- 24.6%
- Poor-condition share
- 61
- public highway bridges
- 1966
- 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.
Amador County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Amador County ranks #58 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 24.6%). Amador County, California contains 61 public highway bridges. Roughly 37.7% are rated “Good,” 37.7% “Fair,” and 24.6% “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
37.7%
23 of 61 rated 7-9
Fair condition
37.7%
23 of 61 rated 5-6
Poor condition
24.6%
15 of 61 rated 4 or below
In-state Poor-share rank
#58 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 61 NBI-tracked bridges by lowest applicable component rating.
Good 37.7% (23)
Fair 37.7% (23)
Poor 24.6% (15)
Amador County's Poor-condition bridges carry 28,160 vehicle crossings a day
That is 12.6% of the county's reported daily bridge traffic on 24.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,877 crossings a day against 5,822 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 61 of 61 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
62.3% of Amador County's bridges have passed the 50-year mark
38 of the 61 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 37.7% 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 39.1% of the county's Poor-condition bridge traffic
STATE ROUTE 104 over SUTTER CREEK, built 1970, carries 11,000 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 15-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 28,160 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Amador County's bridges were built
61 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s
1920–1929
10 bridges
- 1930s 3
1930–1939
3 bridges
- 1940s
1940–1949
8 bridges
- 1950s
1950–1959
6 bridges
- 1960s
1960–1969
5 bridges
- 1970s
1970–1979
6 bridges
- 1980s
1980–1989
4 bridges
- 1990s
1990–1999
4 bridges
- 2000s
2000–2009
8 bridges
- 2010s
2010–2019
6 bridges
What this shows Construction peaked in the 1920s, when 10 of the county's bridges still in the inventory were built, which is 16.4% of those with a recorded year. That cohort is now 95 to 104 years old in the 2024 inventory. Its average build year (1966) matches the California average (1970).
How Amador County compares with California's closest counties by inventory size
The 5 California counties nearest Amador County in number of bridges, with their condition splits. Its 24.6% Poor share is the 6th-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1971 is 5 years older.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Modoc County | 87 | 49.4% | 49.4% | 1.1% | 1969 |
| San Benito County | 76 | 46.1% | 43.4% | 10.5% | 1971 |
| Inyo County | 66 | 63.6% | 31.8% | 4.5% | 1972 |
| Sierra County | 65 | 40% | 52.3% | 7.7% | 1972 |
| Amador County (this page) | 61 | 37.7% | 37.7% | 24.6% | 1966 |
| Mono County | 49 | 63.3% | 24.5% | 12.2% | 1970 |
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 Amador 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 Amador County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (61 bridges here).
- Cheyenne County, CO · 61 bridges
- Montezuma County, CO · 61 bridges
- Atkinson County, GA · 61 bridges
- Candler County, GA · 61 bridges
Similar average build year
Nearest mean year-built outside CA (1966 here).
- Butler County, KS · avg 1966 · 591 bridges
- Grafton County, NH · avg 1966 · 544 bridges
- Queens County, NY · avg 1966 · 514 bridges
- Lehigh County, PA · avg 1966 · 381 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (15)
PITT STREET
PoorOver: JACKSON CREEK
NW STATE ROUTE 88, Amador, CA
Built 1925 Load: 0.0 t ADT: 800
OLD AMADOR ROAD
PoorOver: RANCHERIA CREEK
0.8 MI NW OF MAIN ST, Amador, CA
Built 1925 Load: 0.0 t ADT: 25
BELL ROAD
PoorOver: PIGEON CREEK
0.4 MI E/O SH 49, Amador, CA
Built 1925 Load: 15.2 t ADT: 26
BELL ROAD
PoorOver: BIG INDIAN CREEK
0.15 MI E/O SH 49, Amador, CA
Built 1925 Load: 16.2 t ADT: 26
FIDDLETOWN ROAD
PoorOver: NORTH FORK DRY CREEK
0.2 MI E AMERICAN FLAT RD, Amador, CA
Built 1923 Load: 16.8 t ADT: 1,237
SHENANDOAH ROAD
PoorOver: BIG INDIAN CREEK
1 MI N PLMTH FIDLETOWN RD, Amador, CA
Built 1930 Load: 16.8 t ADT: 3,006
FIVE MILE DRIVE
PoorOver: MULE CREEK
1 MI S/O SH 104, Amador, CA
Built 1925 Load: 17.2 t ADT: 260
STATE ROUTE 104
PoorOver: SUTTER CREEK
10-AMA-104-R5.86-ION, Amador, CA
Built 1970 Load: 21.4 t ADT: 11,000
LAWRENCE ROAD
PoorOver: SOUTH FORK COSUMNES RIV
EL DORADO CO LINE, Amador, CA
Built 1960 Load: 22.4 t ADT: 25
STATE ROUTE 88
PoorOver: SILVER LAKE SPILLWAY
10-AMA-088-R65.82, Amador, CA
Built 2002 Load: 32.4 t ADT: 2,750
STATE ROUTE 104
PoorOver: DRY CREEK
10-AMA-104-R3.62, Amador, CA
Built 2005 Load: 32.4 t ADT: 2,350
SHENANDOAH ROAD
PoorOver: SOUTH FORK COSUMNES RIV
IN RIVER PINES, Amador, CA
Built 1985 Load: 32.4 t ADT: 2,450
MAIN STREET
PoorOver: AMADOR CREEK
WATER STREET, Amador, CA
Built 2014 Load: 32.4 t ADT: 2,000
ROSE LANE
PoorOver: NORTH FORK JACKSON CREEK
50 FT WEST OF N. MAIN ST., Amador, CA
Built 1971 Load: 34.3 t ADT: 30
STATE ROUTE 49
PoorOver: COSUMNES RIVER
10-AMA-049-22.09, Amador, CA
Built 1952 Load: 44.1 t ADT: 2,175
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.