Lake County, CA

129 public highway bridges

Lake County Bridge Snapshot

Lake County, California contains 129 public highway bridges in the FHWA National Bridge Inventory. Roughly 27.1% are rated “Good,” 59.7% “Fair,” 7.8% “Poor,” and 7.8% 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.

129
Total Bridges
27.1%
Good
7.8%
Poor
7.8%
Structurally Deficient

Condition Distribution

Good
27.1% (35)
Fair
59.7% (77)
Poor
7.8% (10)
SD
7.8% (10)

All Bridges (129)

OLD STATE HIGHWAY

Good

Over: BURNS VALLEY CREEK

1.5 MI NW SR 53 & OLYMP, Lake, CA

Built 1999 Load: 32.4 t ADT: 640

ISLAND DR

Good

Over: CLEARLAKE OAKS CHANNEL

1/4 MI E SR 20, Lake, CA

Built 1985 Load: 32.4 t ADT: 390

HILDERBRAND DR

Good

Over: SAINT HELENA CREEK

0.1 MI E OF SR 29, Lake, CA

Built 2014 Load: 32.4 t ADT: 50

MATHEWS ROAD

Good

Over: MANNING CREEK

0.1 MI S OF SR 175, Lake, CA

Built 2017 Load: 32.4 t ADT: 310

FOARD RD

Good

Over: ANDERSON CREEK

0.1 MI S ANDERSON SPNG RD, Lake, CA

Built 2017 Load: 32.4 t ADT: 30

HIGHLAND SPRING RD

Good

Over: HIGHLAND CREEK

4.4 MI SW/O BELL HILL RD, Lake, CA

Built 2015 Load: 32.4 t ADT: 52

ACKLEY RD

Good

Over: MANNING CREEK

0.1 MI N/O MATHEWS RD, Lake, CA

Built 2015 Load: 32.4 t ADT: 250

SODA BAY RD

Good

Over: COLE CREEK

6.0 MI E/O S.R. 29, Lake, CA

Built 2015 Load: 32.4 t ADT: 2,060

DRY CREEK RD

Good

Over: DRY CREEK

2 MI W OF SR 29, Lake, CA

Built 2017 Load: 32.4 t ADT: 20

HARBIN SPRINGS RD

Good

Over: HARBIN CREEK

2.5 MI NW OF BIG CYN RD, Lake, CA

Built 2018 Load: 32.4 t ADT: 690

MOCKINGBIRD LANE

Good

Over: ROBINSON CREEK

0.3 MI NW OF ROUTE 29, Lake, CA

Built 2018 Load: 32.4 t ADT: 46

PARNUM ROAD (US20

Good

Over: North Fork Cache Creek

4.7 MILES NW OF CLEARLAKE, Lake, CA

Built 2021 Load: 32.4 t ADT: 1

STATE ROUTE 29

Good

Over: SAINT HELENA CREEK

01-LAK-029-1.26, Lake, CA

Built 1947 Load: 36.3 t ADT: 8,300

PERINI ROAD

Good

Over: SEIGLER CANYON CREEK

AT SEIGLER CYN RD, Lake, CA

Built 2007 Load: 37.3 t ADT: 75

ROAD M01

Good

Over: SMOKEHOUSE CRK

N. OF LAKE PILLSBURY, Lake, CA

Built 1976 Load: 37.3 t ADT: 313

ROAD M1

Good

Over: SALMON CREEK

N. OF LAKE PILLSBURY, Lake, CA

Built 1976 Load: 37.3 t ADT: 318

STATE ROUTE 29

Good

Over: SAINT HELENA CREEK

01-LAK-029-0.17, Lake, CA

Built 1947 Load: 39.2 t ADT: 7,000

HARBIN SPRINGS RD

Good

Over: HARBIN CREEK

2.3 MI NW OF BIG CYN RD, Lake, CA

Built 1930 Load: 41.1 t ADT: 152

ROAD 16N30

Good

Over: ALLEY CREEK

1.6 MI. N.E. UPLAKE R.S., Lake, CA

Built 1972 Load: 41.5 t ADT: 25

S COW MTN -8 MILE

Poor

Over: Panther Creek

11.4 miles SE of Ukiah, Lake, CA

Built 2000 Load: 6.5 t ADT: 25

CHALK MTN RD

Poor

Over: NORTH FORK CACHE CREEK

IN SPRING VALLEY LAKE DEV, Lake, CA

Built 1967 Load: 8.7 t ADT: 15

34013: HUNTING CRE

Poor

Over: HUNTING CREEK

20.4 mi W of Lower Lake,, Lake, CA

Built 2003 Load: 13.0 t ADT: 25

WOLF CREEK ROAD

Poor

Over: WOLF CREEK

IN SPRING VALLEY LAKE DEV, Lake, CA

Built 1967 Load: 16.5 t ADT: 26

BARTLETT SPRNGS RD

Poor

Over: BARTLETT CREEK

19 MI E OF SR 20, Lake, CA

Built 1950 Load: 33.0 t ADT: 108

BIG CANYON ROAD

Poor

Over: BIG CANYON CREEK

8 MI N OF SR 175, Lake, CA

Built 1930 Load: 36.0 t ADT: 308

ELK MOUNTAIN RD

Poor

Over: SODA CREEK

SIMMONS RD IN HULLVILLE, Lake, CA

Built 1979 Load: 37.6 t ADT: 169

ROAD M1

Structurally Deficient

Over: EEL RIVER

13 MILES NE POTTER VALLEY, Lake, CA

Built 1971 ADT: 350

BIG CANYON ROAD

Structurally Deficient

Over: BIG CANYON CREEK

8 1/4 MI N OF SR 175, Lake, CA

Built 1930 Load: 35.6 t ADT: 304

BIG CANYON RD

Structurally Deficient

Over: BIG CANYON CREEK

10 MI N OF SR 175, Lake, CA

Built 1956 Load: 43.4 t ADT: 208

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