US Bridges

Del Rio RD over Graves Creek

Fair

San Luis Obispo County, California · 0.40 MI W of SR 101 · Structure no. 49C0163

Built
1957
68 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
3,500
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Del Rio RD over Graves Creek is a steel stringer/multi-beam or girder carrying Del Rio RD over Graves Creek in San Luis Obispo County, California. It was built in 1957, so it is 68 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 3,500 vehicles a day, roughly 3% of them trucks, projected to reach 4,135 by 2041. The structure is 60 ft (18.3 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesDel Rio RD
CrossesGraves Creek
Location0.40 MI W of SR 101
RouteCity Street 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.51154, -120.70495
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.2 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span56 ft (17.1 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2010)
Projected traffic4,135 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Del Rio RD over Graves Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Del Rio RD over Graves 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 July 2023.

How much traffic does Del Rio RD over Graves Creek carry?

About 3,500 vehicles per day (2010 count), of which roughly 3% are trucks.

How long is Del Rio RD over Graves Creek?

The structure is 60 ft (18.3 m) long with a longest span of 56 ft (17.1 m) and a deck 24 ft wide.

Who owns Del Rio RD over Graves Creek?

It is owned by the City or Municipal Highway Agency.