US Bridges

Warm Springs RD over Yulupa Creek

Fair

Sonoma County, California · 11.15 MI N of S.H. 116 · Structure no. 20C0217

Built
1930
95 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
2,700
2015 count
Owner
County
County Highway Agency

About this bridge

Warm Springs RD over Yulupa Creek is a concrete continuous culvert carrying Warm Springs RD over Yulupa Creek in Sonoma County, California. It was built in 1930, so it is 95 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 5 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 2,700 vehicles a day, roughly 5% of them trucks, projected to reach 2,948 by 2040. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesWarm Springs RD
CrossesYulupa Creek
Location11.15 MI N of S.H. 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.37928, -122.55291
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span11 ft (3.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2015)
Projected traffic2,948 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Warm Springs RD over Yulupa Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Warm Springs RD over Yulupa 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 May 2023.

How much traffic does Warm Springs RD over Yulupa Creek carry?

About 2,700 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Warm Springs RD over Yulupa Creek?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.3 m) and a deck 26 ft wide.

Who owns Warm Springs RD over Yulupa Creek?

It is owned by the County Highway Agency.