US Bridges

Route 74 over Decker Canyon

Fair

Riverside County, California · 08-RIV-074-3.50 · Structure no. 56 0170

Built
1931
94 years old, rebuilt 1990
Condition
Fair
inspected June 2023
Type
Arch - Deck
Masonry
Length
25 ft
1 main span
Daily traffic
8,600
2020 count
Owner
State
State Highway Agency

About this bridge

Route 74 over Decker Canyon is a masonry arch - deck carrying Route 74 over Decker Canyon in Riverside County, California. It was built in 1931 and reconstructed in 1990, so it is 94 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 8,600 vehicles a day, roughly 7% of them trucks, projected to reach 19,916 by 2041. The structure is 25 ft (7.6 m) long and 42 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesRoute 74
CrossesDecker Canyon
Location08-RIV-074-3.50
RouteState Highway 74
CountyRiverside County
StateCalifornia
Coordinates33.62091, -117.42391
Functional classRural Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadH 15
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2020)
Projected traffic19,916 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 Route 74 over Decker Canyon built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1990.

What condition is Route 74 over Decker Canyon 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 Route 74 over Decker Canyon carry?

About 8,600 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is Route 74 over Decker Canyon?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 42 ft wide.

Who owns Route 74 over Decker Canyon?

It is owned by the State Highway Agency.