Lake County, CA

129 public highway bridges

Lake County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lake County, California contains 129 public highway bridges. Roughly 27.1% are rated “Good,” 59.7% “Fair,” and 7.8% “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.

129
Total Bridges
27.1%
Good
59.7%
Fair
7.8%
Poor Condition

Condition Distribution

Good
27.1% (35)
Fair
59.7% (77)
Poor
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

ROAD M1

Poor

Over: EEL RIVER

13 MILES NE POTTER VALLEY, Lake, CA

Built 1971 ADT: 350

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

Built 1930 Load: 35.6 t ADT: 304

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

BIG CANYON RD

Poor

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 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.