US Bridges

Willow Glen RD over Rainbow Creek

Fair

San Diego County, California · 1.4MI N/O Mission RD · Structure no. 57C0142

Built
1984
41 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
85 ft
2 main spans
Daily traffic
329
2016 count
Owner
County
County Highway Agency

About this bridge

Willow Glen RD over Rainbow Creek is a concrete continuous slab carrying Willow Glen RD over Rainbow Creek in San Diego County, California. It was built in 1984, so it is 41 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 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 329 vehicles a day, roughly 2% of them trucks, projected to reach 471 by 2045. The structure is 85 ft (25.9 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWillow Glen RD
CrossesRainbow Creek
Location1.4MI N/O Mission RD
CountySan Diego County
StateCalifornia
Coordinates33.40756, -117.20226
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating70.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span40 ft (12.2 m)
Deck width34 ft (10.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic329 (2016)
Projected traffic471 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Willow Glen RD over Rainbow Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Willow Glen RD over Rainbow 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 June 2023.

How much traffic does Willow Glen RD over Rainbow Creek carry?

About 329 vehicles per day (2016 count), of which roughly 2% are trucks.

How long is Willow Glen RD over Rainbow Creek?

The structure is 85 ft (25.9 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.

Who owns Willow Glen RD over Rainbow Creek?

It is owned by the County Highway Agency.