US Bridges

JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp

Fair

Orange County, California · 12-ORA-261-0.25-IRVN · Structure no. 55 0898

Built
1997
28 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
366 ft
3 main spans
Daily traffic
19,210
2020 count
Owner
State
State Highway Agency

About this bridge

JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp is a prestressed concrete continuous box beam or girders - multiple carrying JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp in Orange County, California. It was built in 1997, so it is 28 years old, younger 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 19,210 vehicles a day, roughly 3% of them trucks, projected to reach 22,963 by 2043. The structure is 366 ft (111.6 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesJAMBOREE-S261 Onrp
CrossesS261-WALNUT Ave Off-Ramp
Location12-ORA-261-0.25-IRVN
RouteState Highway 261
CountyOrange County
StateCalifornia
Coordinates33.71573, -117.79876
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length366 ft (111.6 m)
Longest span152 ft (46.3 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,210 (2020)
Projected traffic22,963 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp built?

It was built in 1997, making it 28 years old in 2025.

What condition is JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp 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 March 2023.

How much traffic does JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp carry?

About 19,210 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp?

The structure is 366 ft (111.6 m) long with a longest span of 152 ft (46.3 m) and a deck 39 ft wide.

Who owns JAMBOREE-S261 Onrp over S261-WALNUT Ave Off-Ramp?

It is owned by the State Highway Agency.