US Bridges

Gibson Lane over East Fork Russian River

Poor

Mendocino County, California · 0.4 MI W Eel River RD · Structure no. 10C0164

Built
1955
70 years old
Condition
Poor
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
110 ft
3 main spans
Daily traffic
561
2011 count
Owner
County
County Highway Agency

About this bridge

Gibson Lane over East Fork Russian River is a concrete continuous tee beam carrying Gibson Lane over East Fork Russian River in Mendocino County, California. It was built in 1955, so it is 70 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 561 vehicles a day, roughly 2% of them trucks, projected to reach 655 by 2041. The structure is 110 ft (33.5 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesGibson Lane
CrossesEast Fork Russian River
Location0.4 MI W Eel River RD
RouteCounty Highway 0
Coordinates39.33655, -123.11064
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadUnknown
Structure length110 ft (33.5 m)
Longest span44 ft (13.4 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic561 (2011)
Projected traffic655 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$452,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Gibson Lane over East Fork Russian River built?

It was built in 1955, making it 70 years old in 2025.

What condition is Gibson Lane over East Fork Russian River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does Gibson Lane over East Fork Russian River carry?

About 561 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Gibson Lane over East Fork Russian River?

The structure is 110 ft (33.5 m) long with a longest span of 44 ft (13.4 m) and a deck 20 ft wide.

Who owns Gibson Lane over East Fork Russian River?

It is owned by the County Highway Agency.