US Bridges

Simmons Road over Olney Creek

Fair

Shasta County, California · 1 MI S Placer RD · Structure no. 06C0276

Built
1940
85 years old, rebuilt 1975
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
38 ft
2 main spans
Daily traffic
200
2013 count
Owner
County
County Highway Agency

About this bridge

Simmons Road over Olney Creek is a concrete continuous slab carrying Simmons Road over Olney Creek in Shasta County, California. It was built in 1940 and reconstructed in 1975, so it is 85 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 200 vehicles a day, roughly 1% of them trucks, projected to reach 358 by 2044. The structure is 38 ft (11.6 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSimmons Road
CrossesOlney Creek
Location1 MI S Placer RD
RouteCounty Highway 0
Coordinates40.53861, -122.45634
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 48 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 rating98.5 US tons
Inventory rating60 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2013)
Projected traffic358 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Simmons Road over Olney Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1975.

What condition is Simmons Road over Olney 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 August 2024.

How much traffic does Simmons Road over Olney Creek carry?

About 200 vehicles per day (2013 count), of which roughly 1% are trucks.

How long is Simmons Road over Olney Creek?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 21 ft wide.

Who owns Simmons Road over Olney Creek?

It is owned by the County Highway Agency.