US Bridges

Dry Crk Canyon RD over Lytton Springs Creek

Good

Sonoma County, California · Intersection Lytton RD · Structure no. 20C0154

Built
1935
90 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
2,800
2015 count
Owner
County
County Highway Agency

About this bridge

Dry Crk Canyon RD over Lytton Springs Creek is a concrete continuous culvert carrying Dry Crk Canyon RD over Lytton Springs Creek in Sonoma County, California. It was built in 1935, so it is 90 years old, older 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 5,398 by 2046. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesDry Crk Canyon RD
CrossesLytton Springs Creek
LocationIntersection Lytton RD
RouteCounty Highway 0
Coordinates38.64871, -122.91023
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2015)
Projected traffic5,398 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dry Crk Canyon RD over Lytton Springs Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is Dry Crk Canyon RD over Lytton Springs 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 October 2024.

How much traffic does Dry Crk Canyon RD over Lytton Springs Creek carry?

About 2,800 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Dry Crk Canyon RD over Lytton Springs Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Dry Crk Canyon RD over Lytton Springs Creek?

It is owned by the County Highway Agency.