US Bridges

Route 74 over Morrill Canyon

Fair

Riverside County, California · 08-RIV-074-3.08 · Structure no. 56 0169

Built
1931
94 years old
Condition
Fair
inspected June 2023
Type
Arch - Deck
Masonry
Length
30 ft
1 main span
Daily traffic
11,730
2016 count
Owner
State
State Highway Agency

About this bridge

Route 74 over Morrill Canyon is a masonry arch - deck carrying Route 74 over Morrill Canyon in Riverside County, California. It was built in 1931, 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 11,730 vehicles a day, roughly 7% of them trucks, projected to reach 19,982 by 2040. The structure is 30 ft (9.2 m) long and 29 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesRoute 74
CrossesMorrill Canyon
Location08-RIV-074-3.08
RouteState Highway 74
CountyRiverside County
StateCalifornia
Coordinates33.61603, -117.42598
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadH 15
Structure length30 ft (9.2 m)
Longest span30 ft (9.2 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,730 (2016)
Projected traffic19,982 by 2040
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 statusEligible 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 Morrill Canyon built?

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

What condition is Route 74 over Morrill 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 Morrill Canyon carry?

About 11,730 vehicles per day (2016 count), of which roughly 7% are trucks.

How long is Route 74 over Morrill Canyon?

The structure is 30 ft (9.2 m) long with a longest span of 30 ft (9.2 m) and a deck 29 ft wide.

Who owns Route 74 over Morrill Canyon?

It is owned by the State Highway Agency.