Trinity County, CA

194 public highway bridges

Trinity County Bridge Snapshot

Trinity County, California contains 194 public highway bridges in the FHWA National Bridge Inventory. Roughly 56.2% are rated “Good,” 39.7% “Fair,” 4.1% “Poor,” and 4.1% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

194
Total Bridges
56.2%
Good
4.1%
Poor
4.1%
Structurally Deficient

Condition Distribution

Good
56.2% (109)
Fair
39.7% (77)
Poor
4.1% (8)
SD
4.1% (8)

All Bridges (194)

CEDAR CREEK

Good

Over: BEAR CREEK

NO DATA ENTERED, Trinity, CA

Built 1989 ADT: 50

TURNPIKE ROAD

Good

Over: TRINITY RIVER

LEWISTON, Trinity, CA

Built 1902 Load: 5.2 t ADT: 751

EAST SIDE ROAD

Good

Over: TRINITY RIVER

0.1 MI E OF STATE RTE 3, Trinity, CA

Built 1961 Load: 14.3 t ADT: 420

NO DATA ENTERED

Good

Over: LICK CREEK

NO DATA ENTERED, Trinity, CA

Built 1978 Load: 18.1 t ADT: 50

TULE CREEK ROAD

Good

Over: SALT CREEK

0.8 MI WEST OF S.R. 3, Trinity, CA

Built 1947 Load: 18.5 t ADT: 670

WILDWOOD-MAD RIVER

Good

Over: SOUTH FORK TRINITY RIVER

NO DATA ENTERED, Trinity, CA

Built 1963 Load: 19.4 t ADT: 50

STATE ROUTE 299

Good

Over: MANZANITA CREEK

02-TRI-299-28.99, Trinity, CA

Built 1923 Load: 21.7 t ADT: 3,650

STATE ROUTE 3

Good

Over: DOBBINS GULCH

02-TRI-003-0.54, Trinity, CA

Built 1959 Load: 22.7 t ADT: 495

STATE ROUTE 36

Good

Over: LOWER RATTLESNAKE CREEK

02-TRI-036-20.07, Trinity, CA

Built 1969 Load: 23.7 t ADT: 560

STATE ROUTE 36

Good

Over: RATTLESNAKE CREEK

02-TRI-036-19.11, Trinity, CA

Built 1975 Load: 24.3 t ADT: 560

INDIAN VALLEY

Good

Over: BUTTER CREEK

NO DATA ENTERED, Trinity, CA

Built 1965 Load: 24.6 t ADT: 50

STATE ROUTE 3

Good

Over: LITTLE CREEK

02-TRI-003-25.55, Trinity, CA

Built 1955 Load: 25.3 t ADT: 1,450

VAN DUZEN ROAD

Good

Over: HOLLY CREEK

11.8 MI SOUTH SR 36, Trinity, CA

Built 1977 Load: 25.3 t ADT: 578

RATTLESNAKE RIDGE

Good

Over: RATTLESNAKE CREEK

HELLS GATE CAMPGROUND, Trinity, CA

Built 1965 Load: 25.9 t ADT: 50

CANYON CREEK ROAD

Good

Over: CANYON CREEK

10.6 MI N OF JUNCTION CTY, Trinity, CA

Built 1967 Load: 27.5 t ADT: 170

STATE ROUTE 3

Good

Over: RAMSHORN CREEK

02-TRI-003-73.47, Trinity, CA

Built 1969 Load: 28.8 t ADT: 200

PARKS CREEK

Good

Over: LITTLE TRINITY RIVER

NO DATA ENTERED, Trinity, CA

Built 1974 Load: 30.1 t ADT: 50

HYAMPOM ROAD

Good

Over: HAYFORK CREEK

23.2 MI WEST OF SR 3, Trinity, CA

Built 1978 Load: 31.1 t ADT: 330

STATE ROUTE 299

Good

Over: TRINITY RIVER

02-TRI-299-13.87, Trinity, CA

Built 1985 Load: 32.4 t ADT: 2,650

STATE ROUTE 299

Good

Over: NORTH FORK TRINITY RIVER

02-TRI-299-36.89, Trinity, CA

Built 1984 Load: 32.4 t ADT: 3,325

STATE ROUTE 36

Good

Over: SOUTH FORK TRINITY RIVER

02-TRI-036-16.82, Trinity, CA

Built 1979 Load: 32.4 t ADT: 560

STATE ROUTE 3

Good

Over: RUSH CREEK

02-TRI-003-38.73, Trinity, CA

Built 2000 Load: 32.4 t ADT: 865

STATE ROUTE 3

Good

Over: SCOTT MOUNTAIN CREEK

02-TRI-003-T81.23, Trinity, CA

Built 1982 Load: 32.4 t ADT: 190

STATE ROUTE 3

Good

Over: HILLSIDE

02-TRI-003-49.71, Trinity, CA

Built 1986 Load: 32.4 t ADT: 865

STATE ROUTE 299

Good

Over: TRINITY RIVER

02-TRI-299-R3.44, Trinity, CA

Built 1991 Load: 32.4 t ADT: 3,800

STATE ROUTE 299

Good

Over: LITTLE BROWNS CREEK

02-TRI-299-54.54, Trinity, CA

Built 1999 Load: 32.4 t ADT: 5,375

SR 3

Good

Over: EAST FORK STUART FORK CR

02-TRI-003-53.69, Trinity, CA

Built 2008 Load: 32.4 t ADT: 865

STATE ROUTE 3

Good

Over: HAYFORK CREEK

02-TRI-003-6.52, Trinity, CA

Built 2006 Load: 32.4 t ADT: 1,405

STATE ROUTE 3

Good

Over: MINNEHAHA CREEK

02-TRI-003-70.70, Trinity, CA

Built 2012 Load: 32.4 t ADT: 200

STATE ROUTE 299

Good

Over: HILLSIDE

02-TRI-299-12.50, Trinity, CA

Built 2017 Load: 32.4 t ADT: 2,650

STATE ROUTE 299

Good

Over: HILLSIDE

02-TRI-299-12.70, Trinity, CA

Built 2017 Load: 32.4 t ADT: 2,650

STATE ROUTE 36

Good

Over: DITCH GULCH

02-TRI-036-R27.00, Trinity, CA

Built 2022 Load: 32.4 t ADT: 300

STATE ROUTE 3

Good

Over: SWIFT CREEK

02-TRI-003-R60.01, Trinity, CA

Built 2022 Load: 32.4 t ADT: 645

EAGLE CRK LOOP RD

Good

Over: TRINITY RIVER

0.25 MI NW OF S. R. 3, Trinity, CA

Built 2001 Load: 32.4 t ADT: 50

RAMSHORN ROAD

Good

Over: RAMSHORN CREEK

1.5 MI E OF S.R. 3, Trinity, CA

Built 1992 Load: 32.4 t ADT: 70

RUTH-ZENIA ROAD

Good

Over: MAD RIVER

17.0 MI S OF S.H.36, Trinity, CA

Built 1991 Load: 32.4 t ADT: 167

MILL STREET

Good

Over: MIDDLE WEAVER CREEK

0.5 MI SOUTH OF SR 299, Trinity, CA

Built 1986 Load: 32.4 t ADT: 330

COFFEE CREEK ROAD

Good

Over: NORTH FORK COFFEE CREEK

8.7 MI WEST OF S.R. 3, Trinity, CA

Built 1977 Load: 32.4 t ADT: 76

COFFEE CREEK ROAD

Good

Over: EAST FORK COFFEE CREEK

7.35 MI W OF SR 3, Trinity, CA

Built 1987 Load: 32.4 t ADT: 76

OREGON STREET

Good

Over: WEST WEAVER CREEK

1.4 MI W CARSON ST, Trinity, CA

Built 2000 Load: 32.4 t ADT: 103

RUTH-ZENIA ROAD

Good

Over: VAN DUZEN RIVER

14.8 MI FROM SR 36, Trinity, CA

Built 2003 Load: 32.4 t ADT: 88

HOAGLIN ROAD

Good

Over: KETTENPOM CREEK

2.9 MI E ZEN LAKE MTN RD, Trinity, CA

Built 2006 Load: 32.4 t ADT: 100

DEERLICK SPRING RD

Good

Over: BROWNS CREEK

2.05 MI S/O SR 3, Trinity, CA

Built 2005 Load: 32.4 t ADT: 47

MAD RIVER ROAD

Good

Over: OLSEN CREEK

1.5 MI S OF RTE 36, Trinity, CA

Built 2002 Load: 32.4 t ADT: 31

MAD RIVER ROAD

Good

Over: DUNBAR CREEK

5.9 MI S OF SR 36, Trinity, CA

Built 2004 Load: 32.4 t ADT: 50

EVANS BAR ROAD

Good

Over: SOLDIER CREEK

0.3 MI WEST DUTCH CRK RD, Trinity, CA

Built 2006 Load: 32.4 t ADT: 250

DUTCH CREEK ROAD

Good

Over: SOLDIER CREEK

4 MI SOUTH OF SR 299, Trinity, CA

Built 2006 Load: 32.4 t ADT: 500

EAST FORK ROAD

Good

Over: HALLS GULCH

0.7 MI NE OF EAST SIDE RD, Trinity, CA

Built 2013 Load: 32.4 t ADT: 100

ROUNDY ROAD

Good

Over: LITTLE BROWNS CREEK

0.07 MI WEST OF SR 3, Trinity, CA

Built 2007 Load: 32.4 t ADT: 50

BIG CREEK ROAD

Good

Over: PACKERS CREEK

7.5 MI N OR SR3 (HAYFORK), Trinity, CA

Built 2009 Load: 32.4 t ADT: 100

Read our methodology — how this data is sourced, computed, and verified.

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial