US Bridges

Interstate 5 over Mott Road

Good

Siskiyou County, California · 02-SIS-005-5.90 · Structure no. 02 0180L

Built
1976
49 years old, rebuilt 2019
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
103 ft
1 main span
Daily traffic
20,000
2015 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 over Mott Road is a prestressed concrete box beam or girders - multiple carrying Interstate 5 over Mott Road in Siskiyou County, California. It was built in 1976 and reconstructed in 2019, so it is 49 years old, younger 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 20,000 vehicles a day, roughly 29% of them trucks, projected to reach 28,000 by 2040. The structure is 103 ft (31.4 m) long and 60 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesInterstate 5
CrossesMott Road
Location02-SIS-005-5.90
RouteInterstate 5
Coordinates41.25741, -122.27078
Functional classRural Principal Arterial - Interstate

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.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating51.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span101 ft (30.7 m)
Deck width60 ft (18.4 m)
Roadway width57 ft (17.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2015)
Projected traffic28,000 by 2040
Trucks29%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Interstate 5 over Mott Road built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2019.

What condition is Interstate 5 over Mott Road 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 September 2023.

How much traffic does Interstate 5 over Mott Road carry?

About 20,000 vehicles per day (2015 count), of which roughly 29% are trucks.

How long is Interstate 5 over Mott Road?

The structure is 103 ft (31.4 m) long with a longest span of 101 ft (30.7 m) and a deck 60 ft wide.

Who owns Interstate 5 over Mott Road?

It is owned by the State Highway Agency.