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)

UPPER MAD RIVER RD

Good

Over: VAN HORN GULCH

25.4 MI S OF SR 36, Trinity, CA

Built 2014 Load: 32.4 t ADT: 100

LANCE GULCH ROAD

Good

Over: EAST WEAVER CREEK

NE WEAVERVILLE, BY SR 3, Trinity, CA

Built 2016 Load: 32.4 t ADT: 200

UPPER MAD RIVER RD

Good

Over: SOUTH FORK MAD RIVER

28.5 MI S OF SR 36, Trinity, CA

Built 2014 Load: 32.4 t ADT: 100

WEST VAN DUZEN RD

Good

Over: SHANTY CREEK

7.2 MI N OF RUTH-ZENIA RD, Trinity, CA

Built 2014 Load: 32.4 t ADT: 578

COFFEE CREEK ROAD

Good

Over: COFFEE CREEK

13.1 MI W SR 3, Trinity, CA

Built 2017 Load: 32.4 t ADT: 42

RAMSHORN ROAD

Good

Over: MUMBO CREEK

9.6 MI EAST OF SR 3, Trinity, CA

Built 2017 Load: 32.4 t ADT: 15

JORDAN ROAD

Good

Over: LITTLE CREEK

0.1 MI NORTH OF SR 3, Trinity, CA

Built 2017 Load: 32.4 t ADT: 60

COFFEE CREEK ROAD

Good

Over: ADAMS CREEK

15.2 MI WEST OF SR 3, Trinity, CA

Built 2017 Load: 32.4 t ADT: 45

E. FORK HAYFORK RD

Good

Over: N FK E FK HAYFORK CREEK

4.9 MI E WILDWOOD RD, Trinity, CA

Built 2017 Load: 32.4 t ADT: 17

NO DATA ENTERED

Good

Over: NO DATA ENTERED

S21 T3S R8E, Trinity, CA

Built 1974 Load: 32.4 t ADT: 50

BROWNS RANCH ROAD

Good

Over: EAST WEAVER CREEK

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

Built 1955 Load: 32.7 t ADT: 439

STATE ROUTE 3

Good

Over: READING CREEK

02-TRI-003-29.74, Trinity, CA

Built 1968 Load: 33.4 t ADT: 1,450

STATE ROUTE 3

Good

Over: BROWNS CREEK

02-TRI-003-R26.30, Trinity, CA

Built 1973 Load: 34.3 t ADT: 1,450

EAST FORK ROAD

Good

Over: NORTH FORK TRINITY RIVER

1.1 MI NORTH S.R. 299, Trinity, CA

Built 1967 Load: 34.7 t ADT: 200

COFFEE CREEK ROAD

Good

Over: COFFEE CREEK

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

Built 1977 Load: 35.0 t ADT: 76

STATE ROUTE 3

Good

Over: TRINITY RIVER

02-TRI-003-78.11, Trinity, CA

Built 1971 Load: 38.9 t ADT: 200

RUTH-ZENIA ROAD

Good

Over: LITTLE VAN DUZEN RIVER

0.1 MI SW VAN DUZEN RD, Trinity, CA

Built 1971 Load: 38.9 t ADT: 140

ST. JOHN LOOP ROAD

Good

Over: BUTTER CREEK

7.0 MI S HYAMPOM RD, Trinity, CA

Built 1955 Load: 39.5 t ADT: 50

BARKER CR.

Good

Over: BARKER CREEK

NO DATA ENTERED, Trinity, CA

Built 2010 Load: 39.5 t ADT: 50

STATE ROUTE 3

Good

Over: COFFEE CREEK

02-TRI-003-67.70, Trinity, CA

Built 1962 Load: 40.5 t ADT: 645

STATE ROUTE 36

Good

Over: MAD RIVER

02-TRI-036-R2.73, Trinity, CA

Built 1958 Load: 40.8 t ADT: 1,300

STATE ROUTE 299

Good

Over: BIG FRENCH CREEK

02-TRI-299-23.29, Trinity, CA

Built 1952 Load: 41.1 t ADT: 3,100

CORRAL BOTTOM ROAD

Good

Over: TRINITY RIVER

0.1 MI SOUTH OF SR 299, Trinity, CA

Built 1960 Load: 41.5 t ADT: 300

ZENIA BLUFF RD

Good

Over: MUD CREEK

WEST OF ZENIA, Trinity, CA

Built 2003 Load: 42.4 t ADT: 140

STATE ROUTE 299

Good

Over: PONY BAR CREEK

02-TRI-299-5.94, Trinity, CA

Built 1966 Load: 43.1 t ADT: 3,080

NO DATA ENTERED

Good

Over: GOODS CREEK

WILD WOOD, Trinity, CA

Built 2006 Load: 43.1 t ADT: 20

STATE ROUTE 36

Good

Over: HAYFORK CREEK

02-TRI-036-R38.37, Trinity, CA

Built 1965 Load: 43.4 t ADT: 300

HYAMPOM ROAD

Good

Over: HAYFORK CREEK

8.8 MI WEST OF SR 3, Trinity, CA

Built 1948 Load: 44.4 t ADT: 330

WEST VAN DUZEN RD

Good

Over: VAN DUZEN RIVER

8 MI N ZENIA-RUTH RD, Trinity, CA

Built 2013 Load: 45.0 t ADT: 578

UPPER MAD RIVER RD

Good

Over: MAD RIVER

BARRY CREEK ROAD, Trinity, CA

Built 1988 Load: 46.3 t ADT: 31

CANYON CREEK ROAD

Good

Over: LITTLE E FORK CANYON CRK

NE OF HELENA AND SR 299, Trinity, CA

Built 2002 Load: 47.3 t ADT: 20

RUSH CREEK ROAD

Good

Over: RUSH CREEK

4.6 MI SE OF SR 3, Trinity, CA

Built 1958 Load: 47.6 t ADT: 489

STATE ROUTE 3

Good

Over: SUNFLOWER CREEK

02-TRI-003-77.93, Trinity, CA

Built 1971 Load: 48.0 t ADT: 200

STATE ROUTE 3

Good

Over: TRINITY RIVER

02-TRI-003-68.50, Trinity, CA

Built 1968 Load: 48.0 t ADT: 230

STATE ROUTE 3

Good

Over: CARR CREEK

02-TRI-003-13.96, Trinity, CA

Built 1968 Load: 54.4 t ADT: 1,750

CAMPBELL RIDGE RD.

Good

Over: CAMPBELL RIDGE SLIDE

5.4 MI NWEST OF SR299, Trinity, CA

Built 2006 Load: 63.2 t ADT: 100

MAY

Poor

Over: RATTLESNAKE CREEK

FOREST GLEN STA., Trinity, CA

Built 1959 ADT: 50

STEINER FLAT ROAD

Poor

Over: DUTTON CREEK

3.8 MI NW OF SR3 @D.CITY, Trinity, CA

Built 1950 Load: 15.6 t ADT: 100

EAST FK HAYFORK RD

Poor

Over: HAYFORK CREEK

0.2 MI E WILDWOOD ROAD, Trinity, CA

Built 1971 Load: 18.8 t ADT: 50

STATE ROUTE 3

Poor

Over: COFFEE CREEK OVERFLOW

02-TRI-003-67.98, Trinity, CA

Built 1968 Load: 26.6 t ADT: 230

SUMMIT CREEK ROAD

Poor

Over: CARR CREEK

0.1 MI S OF S.R. 3, Trinity, CA

Built 1987 Load: 32.4 t ADT: 300

WILDWOOD-MAD RIVER

Structurally Deficient

Over: DUBAKELLA CREEK

NO DATA ENTERED, Trinity, CA

Built 1972 Load: 19.4 t ADT: 50

PRICE CREEK RD

Structurally Deficient

Over: PRICE CREEK

0.7 MI SOUTH OF SR 299, Trinity, CA

Built 1950 Load: 20.4 t ADT: 20

HYAMPOM ROAD

Structurally Deficient

Over: LITTLE CREEK

6.0 MI W OF SR 3, Trinity, CA

Built 1955 Load: 99.8 t ADT: 330

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

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