US Bridges

County RD 110 over Johnson Creek

Good

Mendocino County, California · 0.7 MI S/E JCT CR 109 · Structure no. 10C0130

Built
1993
32 years old
Condition
Good
inspected February 2022
Type
Slab
Concrete Continuous
Length
83 ft
2 main spans
Daily traffic
114
2011 count
Owner
County
County Highway Agency

About this bridge

County RD 110 over Johnson Creek is a concrete continuous slab carrying County RD 110 over Johnson Creek in Mendocino County, California. It was built in 1993, so it is 32 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 114 vehicles a day, roughly 5% of them trucks, projected to reach 125 by 2044. The structure is 83 ft (25.3 m) long and 27 ft wide.

Location

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CarriesCounty RD 110
CrossesJohnson Creek
Location0.7 MI S/E JCT CR 109
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates38.96276, -123.15051
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length83 ft (25.3 m)
Longest span40 ft (12.2 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic114 (2011)
Projected traffic125 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 110 over Johnson Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is County RD 110 over Johnson Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2022.

How much traffic does County RD 110 over Johnson Creek carry?

About 114 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is County RD 110 over Johnson Creek?

The structure is 83 ft (25.3 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.

Who owns County RD 110 over Johnson Creek?

It is owned by the County Highway Agency.