US Bridges

Modjeska Canyon RD over Santiago Creek

Good

Orange County, California · .4 Mi. E/O Modjeska G RD · Structure no. 55C0173

Built
1947
78 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
1,000
2021 count
Owner
County
County Highway Agency

About this bridge

Modjeska Canyon RD over Santiago Creek is a steel stringer/multi-beam or girder carrying Modjeska Canyon RD over Santiago Creek in Orange County, California. It was built in 1947, so it is 78 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,000 vehicles a day, roughly 1% of them trucks, projected to reach 1,052 by 2041. The structure is 56 ft (17.1 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesModjeska Canyon RD
CrossesSantiago Creek
Location.4 Mi. E/O Modjeska G RD
RouteCounty Highway 0
Coordinates33.70801, -117.62887
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.4 US tons
Inventory rating21.8 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length56 ft (17.1 m)
Longest span55 ft (16.8 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2021)
Projected traffic1,052 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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 Modjeska Canyon RD over Santiago Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is Modjeska Canyon RD over Santiago Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Modjeska Canyon RD over Santiago Creek carry?

About 1,000 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Modjeska Canyon RD over Santiago Creek?

The structure is 56 ft (17.1 m) long with a longest span of 55 ft (16.8 m) and a deck 29 ft wide.

Who owns Modjeska Canyon RD over Santiago Creek?

It is owned by the County Highway Agency.