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)
TIOGA ROAD
FairOver: SOUTH FORK TUOLUMNE RIVE
7.0 miles east from El Po, Tuolumne, CA
Built 1937 Load: 29.0 t ADT: 2,041
STATE ROUTE 49
FairOver: NEW MELONES RESVERVOIR
10-TUO-049-R27.28, Tuolumne, CA
Built 1976 Load: 30.8 t ADT: 5,600
TIOGA ROAD
FairOver: TUOLUMNE RIVER
7.0 miles E from El Porta, Tuolumne, CA
Built 1934 Load: 30.8 t ADT: 2,041
ROCK RIVER ROAD
FairOver: DRY CREEK
2 MI S GREEN SPRINGS RD, Tuolumne, CA
Built 1937 Load: 31.1 t ADT: 75
IRR BIA RTE 141
FairOver: TURNBACK CREEK
MIWU RD 1.2KM E OF W HANI, Tuolumne, CA
Built 1980 Load: 31.6 t ADT: 20
SR 108
FairOver: SERA & SANGUINETTI RD
10-TUO-108-R2.02-SRA, Tuolumne, CA
Built 1987 Load: 32.4 t ADT: 17,450
SR 108
FairOver: SIERRA RR SANGUINETTI RD
10-TUO-108-R2.02-SRA, Tuolumne, CA
Built 2004 Load: 32.4 t ADT: 2,500
CROOKED LANE
FairOver: STATE ROUTE 108
10-TUO-108-R0.65-SRA, Tuolumne, CA
Built 1987 Load: 32.4 t ADT: 1,000
STATE ROUTE 108
FairOver: MID FORK STANISLAUS RIV
10-TUO-108-53.26, Tuolumne, CA
Built 1992 Load: 32.4 t ADT: 900
SR 108
FairOver: SULLIVAN CRK / BERGEL RD
10-TUO-108-R2.78, Tuolumne, CA
Built 2004 Load: 32.4 t ADT: 20,800
SR 108
FairOver: HESS AVENUE
10-TUO-108-R3.42, Tuolumne, CA
Built 2004 Load: 32.4 t ADT: 20,800
SR 108
FairOver: MONO WAY
10-TUO-108-4.90, Tuolumne, CA
Built 2013 Load: 32.4 t ADT: 20,800
EVERGREEN ROAD
FairOver: MIDDLE FORK TUOLUMNE RIV
5.2 MI N STATE RTE 120, Tuolumne, CA
Built 2003 Load: 32.4 t ADT: 465
PHOENIX LAKE RD
FairOver: SULLIVAN CREEK
4.1 MI NE OF SR 108, Tuolumne, CA
Built 2010 Load: 32.4 t ADT: 4,796
EVERGREEN ROAD
FairOver: ACKERSON CREEK
2.8 MI NORTH OF ROUTE 120, Tuolumne, CA
Built 2014 Load: 32.4 t ADT: 265
NO DATA ENTERED
FairOver: PHILDEPHIA DITCH SPILLWA
04N88, Tuolumne, CA
Built 1960 Load: 33.0 t ADT: 50
WINDING ROAD
FairOver: CLAVEY RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1970 Load: 35.0 t ADT: 50
OLD WARDS FERRY RD
FairOver: STATE ROUTE 108
10-TUO-108-R1.57-SRA, Tuolumne, CA
Built 1987 Load: 35.3 t ADT: 102
WINDING ROAD
FairOver: TUOLUMNE RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1975 Load: 41.5 t ADT: 50
STATE ROUTE 120
FairOver: MOCCASIN CREEK
10-TUO-120-R24.09, Tuolumne, CA
Built 1971 Load: 44.1 t ADT: 4,400
ALGERINE RD
FairOver: CURTIS CREEK
2.0 MI NW OF TWIST RD, Tuolumne, CA
Built 1925 Load: 66.1 t ADT: 265
WINDING ROAD
GoodOver: BRANCH CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1962 ADT: 50
WINDING ROAD
GoodOver: STANISLAUS RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1957 ADT: 40
CRESTVIEW DRIVE
GoodOver: SULLIVAN CREEK
0.1 MI SOUTH OF CREEKSIDE, Tuolumne, CA
Built 1960 Load: 19.1 t ADT: 1,480
WINDING ROAD
GoodOver: NF STANISLAUS RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1971 Load: 19.1 t ADT: 300
STATE ROUTE 108
GoodOver: S FORK STANISLAUS RIVER
10-TUO-108-31.24, Tuolumne, CA
Built 1937 Load: 19.4 t ADT: 5,100
COLUMBIA WAY
GoodOver: WOODS CREEK
0.3 MI N OF SR 49, Tuolumne, CA
Built 1912 Load: 19.4 t ADT: 375
TUOLUMNE RD
GoodOver: CURTIS CREEK
2.4 MI E/O SR 108, Tuolumne, CA
Built 1947 Load: 20.7 t ADT: 12,283
TUOLUMNE RD
GoodOver: TURNBACK CREEK
0.3 MI W/O CARTER ST, Tuolumne, CA
Built 1961 Load: 22.4 t ADT: 11,848
SR 120
GoodOver: SOUTH FORK TUOLUMNE RIV
10-TUO-120-R53.02, Tuolumne, CA
Built 1964 Load: 24.0 t ADT: 3,650
WINDING ROAD
GoodOver: JAWBONE CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1990 Load: 24.0 t ADT: 50
EVERGREEN ROAD
GoodOver: S FK TUOLUMNE RIVER
1.0 MI S OF SR 120, Tuolumne, CA
Built 1967 Load: 24.3 t ADT: 465
FERRETTI RD
GoodOver: BIG CREEK
3.3 MI NE/O SR 120, Tuolumne, CA
Built 1970 Load: 25.6 t ADT: 1,837
NO DATA ENTERED
GoodOver: TRAMWAY
NO DATA ENTERED, Tuolumne, CA
Built 1900 Load: 25.6 t ADT: 50
STATE ROUTE 49
GoodOver: WOODS CREEK
10-TUO-049-13.52, Tuolumne, CA
Built 1941 Load: 25.9 t ADT: 19,900
WINDING ROAD
GoodOver: HULL CREEK
NO DATA ENTERED, Tuolumne, CA
Built 1990 Load: 28.2 t ADT: 50
STATE ROUTE 120
GoodOver: SOUTH FORK TUOLUMNE RIV
10-TUO-120-46.82, Tuolumne, CA
Built 1962 Load: 29.5 t ADT: 3,650
WINDING ROAD
GoodOver: CLARK FORK OF STANISLAUS
NO DATA ENTERED, Tuolumne, CA
Built 1940 Load: 29.8 t ADT: 350
TUOLUMNE RD NORTH
GoodOver: TURNBACK CREEK
0.45 MI NW BUCHANAN RD, Tuolumne, CA
Built 1929 Load: 30.5 t ADT: 2,613
WINDING ROAD
GoodOver: TUOLUMNE RIVER
NO DATA ENTERED, Tuolumne, CA
Built 1999 Load: 31.4 t ADT: 155
STATE ROUTE 108
GoodOver: EAST AVENUE
10-TUO-108-R11.30, Tuolumne, CA
Built 1966 Load: 31.8 t ADT: 7,900
STATE ROUTE 49
GoodOver: WOODS CREEK
10-TUO-049-15.49, Tuolumne, CA
Built 1951 Load: 32.4 t ADT: 19,900
STATE ROUTE 108
GoodOver: SR 49 NB & WOODS CREEK
10-TUO-108-R0.03-SRA, Tuolumne, CA
Built 1987 Load: 32.4 t ADT: 17,450
SR 108
GoodOver: PEACEFUL OAK RD
10-TUO-108-T4.50, Tuolumne, CA
Built 2013 Load: 32.4 t ADT: 20,800
SOUTH FORK RD
GoodOver: S FORK STANISLAUS RIVER
3.3 MI NW CONFIDENCE S FK, Tuolumne, CA
Built 1999 Load: 32.4 t ADT: 365
HORSE SHOE BEND RD
GoodOver: MORMON CREEK
0.1 MI E SPRINGFIELD RD, Tuolumne, CA
Built 1988 Load: 32.4 t ADT: 600
LA GRANGE ROAD
GoodOver: SALT SPRING CREEK
4.1 MI N/E STNLS CO LINE, Tuolumne, CA
Built 2004 Load: 32.4 t ADT: 2,868
JAMESTOWN RD
GoodOver: WOODS CREEK
0.4 MI NE/O SR49 & 108, Tuolumne, CA
Built 2001 Load: 32.4 t ADT: 2,200
PASEO DE LOS PORTA
GoodOver: SULLIVAN CREEK
0.1M N OF PHOENIX LAKE RD, Tuolumne, CA
Built 1996 Load: 32.4 t ADT: 1,915
HARDIN FLAT ROAD
GoodOver: SOUTH FK TUOLUMNE RIVER
E OF YOSEMITE LAKES ROAD, Tuolumne, CA
Built 2019 Load: 32.4 t ADT: 100
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.