Total bridges
125
Public highway bridges in Tuolumne County
County profile · official public datasets
Tuolumne County, CA
125 public highway bridges tracked in the FHWA National Bridge Inventory: 36% rated Good, 56.8% Fair, 7.2% Poor.
- 125
- Public bridges
- 36%
- Good condition
- 7.2%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Tuolumne County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 33rd
- of 58 on Poor share
- 7.2%
- Poor-condition share
- 125
- public highway bridges
- 1964
- 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.
Tuolumne County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Tuolumne County ranks #33 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.2%). Tuolumne County, California contains 125 public highway bridges. Roughly 36% are rated “Good,” 56.8% “Fair,” and 7.2% “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
36%
45 of 125 rated 7-9
Fair condition
56.8%
71 of 125 rated 5-6
Poor condition
7.2%
9 of 125 rated 4 or below
In-state Poor-share rank
#33 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 125 NBI-tracked bridges by lowest applicable component rating.
Good 36% (45)
Fair 56.8% (71)
Poor 7.2% (9)
Tuolumne County's Poor-condition bridges carry 48,030 vehicle crossings a day
That is 12.2% of the county's reported daily bridge traffic on 7.2% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 5,337 crossings a day against 3,933 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 125 of 125 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
64.8% of Tuolumne County's bridges have passed the 50-year mark
81 of the 125 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 36% 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 52.2% of the county's Poor-condition bridge traffic
MONO WAY over SULLIVAN CREEK, built 1991, carries 25,060 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 9-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 48,030 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Tuolumne County's bridges were built
125 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 7
1910–1919
7 bridges
- 1920s
1920–1929
11 bridges
- 1930s
1930–1939
10 bridges
- 1940s 8
1940–1949
8 bridges
- 1950s
1950–1959
10 bridges
- 1960s
1960–1969
19 bridges
- 1970s
1970–1979
23 bridges
- 1980s 8
1980–1989
8 bridges
- 1990s
1990–1999
10 bridges
- 2000s 7
2000–2009
7 bridges
- 2010s 8
2010–2019
8 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1970s, when 23 of the county's bridges still in the inventory were built, which is 18.4% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1964, 6 years older than the California average of 1970.
How Tuolumne County compares with California's closest counties by inventory size
The 5 California counties nearest Tuolumne County in number of bridges, with their condition splits. Its 7.2% Poor share is the 2nd-lowest of these 6. Its average build year of 1964 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 |
|---|---|---|---|---|---|
| Nevada County | 135 | 45.2% | 40.7% | 14.1% | 1972 |
| Lake County | 129 | 30.2% | 62% | 7.8% | 1970 |
| Yuba County | 127 | 37.8% | 55.9% | 6.3% | 1967 |
| Tuolumne County (this page) | 125 | 36% | 56.8% | 7.2% | 1964 |
| Sutter County | 121 | 33.9% | 52.9% | 13.2% | 1968 |
| Mariposa County | 109 | 21.1% | 67.9% | 11% | 1956 |
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 Tuolumne 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 Tuolumne County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (125 bridges here).
- Hoonah-Angoon County, AK · 125 bridges
- Worth County, GA · 125 bridges
- Stone County, MS · 125 bridges
- Carroll County, OH · 125 bridges
Similar average build year
Nearest mean year-built outside CA (1964 here).
- Bergen County, NJ · avg 1964 · 577 bridges
- Morris County, NJ · avg 1964 · 508 bridges
- Baltimore city County, MD · avg 1964 · 374 bridges
- Ross County, OH · avg 1964 · 356 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (125)
WINDING ROAD
FairOver: ROSE CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1954 ADT: 50
WINDING ROAD
FairOver: TROUT CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1969 ADT: 50
WINDING ROAD
FairOver: CLAVEY RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1971 ADT: 50
WINDING ROAD
FairOver: SKULL CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1966 ADT: 50
WINDING ROAD
FairOver: SHOOFLY CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1970 ADT: 50
WINDING ROAD
FairOver: RATTLESNAKE CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1969 ADT: 50
NO DATA ENTERED
FairOver: BEAVER CREEK
04N38-7.761, Tuolumne, CA
Built 1994 ADT: 50
NO DATA ENTERED
FairOver: DUCK CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1994 ADT: 50
NO DATA ENTERED
FairOver: N/A
NO DATA ENTERED, Tuolumne, CA
Built 1999 ADT: 50
WINDING ROAD
FairOver: HERRING CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1955 ADT: 50
WINDING ROAD
FairOver: NIAGARA CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1964 ADT: 50
WINDING ROAD
FairOver: SOUTH FORK TUOLUMNE RIV
NO DATA ENTERED, Tuolumne, CA
Built 1961 ADT: 50
WINDING ROAD
FairOver: MOORE CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1970 ADT: 50
NO DATA ENTERED
FairOver: HALLS GULCH CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1935 Load: 9.1 t ADT: 50
WARDS FERRY RD
FairOver: DEER CREEK
4.95 MI N OF GROVELAND, Tuolumne, CA
Built 1915 Load: 13.0 t ADT: 120
STATE ROUTE 120
FairOver: DON PEDRO RESERVOIR
10-TUO-120-R19.61, Tuolumne, CA
Built 1971 Load: 14.6 t ADT: 3,800
RAWHIDE RD
FairOver: WOODS CREEK
0.05 MI NW OF SR 49, Tuolumne, CA
Built 1920 Load: 14.6 t ADT: 4,149
OLD WARDS FERRY RD
FairOver: CURTIS CREEK
3.3 MI S SANGUINETTI RD, Tuolumne, CA
Built 1914 Load: 14.9 t ADT: 502
CLARK FORK ROAD
FairOver: MIDDLE FK STANISLAUS RIV
0.7 MI NE OF SR 108, Tuolumne, CA
Built 1940 Load: 14.9 t ADT: 99
HARVARD MINE RD
FairOver: WOODS CREEK
0.6 MI N/E SR 108, Tuolumne, CA
Built 1915 Load: 15.2 t ADT: 130
OLD STRWBRY RD
FairOver: S FK STANISLAUS RIVER
0.85 MI S/O SR 108, Tuolumne, CA
Built 1910 Load: 15.6 t ADT: 275
LIME KILN RD
FairOver: CURTIS CREEK
2.8 MI S/O CAMPO SECO RD, Tuolumne, CA
Built 1922 Load: 15.6 t ADT: 957
CEDAR SPRINGS RD
FairOver: TURNBACK CREEK
1.1 MI S TUOLUMNE RD, Tuolumne, CA
Built 1925 Load: 15.6 t ADT: 150
ALGERINE RD.
FairOver: ALGERINE CREEK
0.4 MI N TWIST RD, Tuolumne, CA
Built 1940 Load: 16.2 t ADT: 263
RAWHIDE RD
FairOver: PEPPERMINT CREEK
0.3 MI NW/O SR49, Tuolumne, CA
Built 1930 Load: 16.5 t ADT: 4,149
SOULSBYVILLE ROAD
FairOver: CURTIS CREEK
0.8 MI SOUTH OF SR 108, Tuolumne, CA
Built 1930 Load: 16.5 t ADT: 3,708
ITALIAN BAR RD
FairOver: EAGLE CREEK
11.9 MI NE BIG HILL ROAD, Tuolumne, CA
Built 1925 Load: 16.8 t ADT: 20
WARDS FERRY RD
FairOver: TUOLUMNE RIVER
7.2 MI NORTH OF SR 120, Tuolumne, CA
Built 1971 Load: 17.5 t ADT: 120
JACKSONVILLE ROAD
FairOver: DON PEDRO RESERVOIR
0.6 MI N/O SR 120, Tuolumne, CA
Built 1970 Load: 17.8 t ADT: 1,491
SOUTH BARRETTA ST
FairOver: SONORA CREEK
100 NORTH OF THEALL, Tuolumne, CA
Built 1920 Load: 18.1 t ADT: 2,000
SOUTHGATE DR
FairOver: SONORA CREEK
SOUTH OF RTE 49, Tuolumne, CA
Built 1940 Load: 19.4 t ADT: 3,000
ITALIAN BAR ROAD
FairOver: S FORK STANISLAUS RIVER
6.75 MI NE BIG HILL RD CO, Tuolumne, CA
Built 1921 Load: 19.8 t ADT: 55
WINDING ROAD
FairOver: N FORK TUOLUMNE RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1981 Load: 19.8 t ADT: 50
DRAPER MINE RD
FairOver: CURTIS CREEK
1 MI S FROM SH 108, Tuolumne, CA
Built 1937 Load: 21.1 t ADT: 783
CLARK FORK ROAD
FairOver: CLARKS FK STANISLAUS RIV
0.9 MI NORTH EAST SR 108, Tuolumne, CA
Built 1950 Load: 21.1 t ADT: 99
PONDEROSA WAY
FairOver: TURNBACK CREEK
0.7 MI SOUTH OF SR 108, Tuolumne, CA
Built 1970 Load: 21.4 t ADT: 922
ITALIAN BAR RD
FairOver: FIVE MILE CREEK
5.2 MI NE BIG HILL RD, Tuolumne, CA
Built 1925 Load: 22.7 t ADT: 55
STATE ROUTE 49
FairOver: WOODS CREEK
10-TUO-049-17.49-SRA, Tuolumne, CA
Built 1902 Load: 23.7 t ADT: 11,500
STATE ROUTE 120
FairOver: ALKALI CREEK
10-TUO-120-11.29, Tuolumne, CA
Built 1914 Load: 24.3 t ADT: 16,000
LA GRANGE RD
FairOver: JOHNSON CREEK
0.3 MI NE/O STAN CO LINE, Tuolumne, CA
Built 1956 Load: 24.3 t ADT: 2,703
CLARK FORK ROAD
FairOver: ARNOT CREEK
6.0 MI NORTH EAST SR 108, Tuolumne, CA
Built 1960 Load: 24.3 t ADT: 41
CRYSTAL FALLS DR
FairOver: SULLIVAN CREEK
2.0 MI N OF LANGEWAY RD, Tuolumne, CA
Built 1970 Load: 24.3 t ADT: 3,266
ALDER LANE
FairOver: SULLIVAN CREEK
0.1 MI N MEADOW BROOK DR, Tuolumne, CA
Built 1960 Load: 24.6 t ADT: 250
SPRAGUE RD.
FairOver: BIG CREEK
2.5 MI W SMITH STA., Tuolumne, CA
Built 1938 Load: 24.6 t ADT: 25
STATE ROUTE 49
FairOver: MOCCASIN CREEK
10-TUO-049-4.47, Tuolumne, CA
Built 1952 Load: 25.3 t ADT: 765
ALGERINE RD
FairOver: SULLIVAN CREEK
2.4 MI N/O TWIST RD, Tuolumne, CA
Built 1952 Load: 26.6 t ADT: 1,950
ALG WARDS FERRY RD
FairOver: BLANKET CREEK
0.9 MI W WARDS FERRY RD, Tuolumne, CA
Built 1936 Load: 26.9 t ADT: 55
KENNEDY MEADOWS RD
FairOver: DEADMANS CREEK
0.9 MI S OF SR 108, Tuolumne, CA
Built 1955 Load: 27.9 t ADT: 100
WINDING ROAD
FairOver: CLAVEY RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1958 Load: 27.9 t ADT: 240
WINDING ROAD
FairOver: REED CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1977 Load: 28.5 t ADT: 50
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.