US Bridges

River Grove DR over Estrella River

Good

San Luis Obispo County, California · 0.15 MI E of Estrella RD · Structure no. 49C0307

Built
1910
115 years old, rebuilt 2020
Condition
Good
inspected May 2023
Type
Truss - Thru
Steel
Length
159 ft
1 main span
Daily traffic
100
2010 count
Owner
County
County Highway Agency

About this bridge

River Grove DR over Estrella River is a steel truss - thru carrying River Grove DR over Estrella River in San Luis Obispo County, California. It was built in 1910 and reconstructed in 2020, so it is 115 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 100 vehicles a day, projected to reach 130 by 2045. The structure is 159 ft (48.5 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRiver Grove DR
CrossesEstrella River
Location0.15 MI E of Estrella RD
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.65293, -120.50807
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56.4 US tons
Inventory rating33.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span154 ft (46.9 m)
Deck width17 ft (5.2 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic100 (2010)
Projected traffic130 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was River Grove DR over Estrella River built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 2020.

What condition is River Grove DR over Estrella River 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 May 2023.

How much traffic does River Grove DR over Estrella River carry?

About 100 vehicles per day (2010 count).

How long is River Grove DR over Estrella River?

The structure is 159 ft (48.5 m) long with a longest span of 154 ft (46.9 m) and a deck 17 ft wide.

Who owns River Grove DR over Estrella River?

It is owned by the County Highway Agency.