US Bridges

Ruddck-Cunninhm RD over Hildreth Creek

Fair

Mendocino County, California · 0.35 MI S Howell Creek RD · Structure no. 10C0150

Built
1955
70 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
619
2011 count
Owner
County
County Highway Agency

About this bridge

Ruddck-Cunninhm RD over Hildreth Creek is a concrete slab carrying Ruddck-Cunninhm RD over Hildreth Creek 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 619 vehicles a day, roughly 2% of them trucks, projected to reach 438 by 2042. The structure is 23 ft (7 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesRuddck-Cunninhm RD
CrossesHildreth Creek
Location0.35 MI S Howell Creek RD
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.10489, -123.17442
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic619 (2011)
Projected traffic438 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ruddck-Cunninhm RD over Hildreth Creek built?

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

What condition is Ruddck-Cunninhm RD over Hildreth Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does Ruddck-Cunninhm RD over Hildreth Creek carry?

About 619 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Ruddck-Cunninhm RD over Hildreth Creek?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 24 ft wide.

Who owns Ruddck-Cunninhm RD over Hildreth Creek?

It is owned by the County Highway Agency.