Trinity County, CA

194 public highway bridges

Trinity County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Trinity County, California contains 194 public highway bridges. Roughly 56.2% are rated “Good,” 39.7% “Fair,” and 4.1% “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.

194
Total Bridges
56.2%
Good
39.7%
Fair
4.1%
Poor Condition

Condition Distribution

Good
56.2% (109)
Fair
39.7% (77)
Poor
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.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge 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.