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)

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

WILDWOOD-MAD RIVER

Poor

Over: DUBAKELLA CREEK

NO DATA ENTERED, Trinity, CA

Built 1972 Load: 19.4 t ADT: 50

PRICE CREEK RD

Poor

Over: PRICE CREEK

0.7 MI SOUTH OF SR 299, Trinity, CA

Built 1950 Load: 20.4 t ADT: 20

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

HYAMPOM ROAD

Poor

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 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.