US Bridges

State Route 46 over Green Valley Creek

Good

San Luis Obispo County, California · 05-SLO-046-R0.89 · Structure no. 49 0206

Built
1974
51 years old
Condition
Good
inspected September 2022
Type
Box Beam or Girders - Multiple
Concrete
Length
75 ft
1 main span
Daily traffic
3,700
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 46 over Green Valley Creek is a concrete box beam or girders - multiple carrying State Route 46 over Green Valley Creek in San Luis Obispo County, California. It was built in 1974, so it is 51 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 3,700 vehicles a day, roughly 4% of them trucks, projected to reach 3,589 by 2042. The structure is 75 ft (22.9 m) long and 42 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesState Route 46
CrossesGreen Valley Creek
Location05-SLO-046-R0.89
RouteState Highway 46
Coordinates35.5339, -121.0345
Functional classRural Minor Arterial

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 inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating55.3 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length75 ft (22.9 m)
Longest span72 ft (21.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,700 (2019)
Projected traffic3,589 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 46 over Green Valley Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is State Route 46 over Green Valley 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 September 2022.

How much traffic does State Route 46 over Green Valley Creek carry?

About 3,700 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is State Route 46 over Green Valley Creek?

The structure is 75 ft (22.9 m) long with a longest span of 72 ft (21.9 m) and a deck 42 ft wide.

Who owns State Route 46 over Green Valley Creek?

It is owned by the State Highway Agency.