US Bridges

S5-S89 & N89-S5 Cn over Interstate 5

Fair

Siskiyou County, California · 02-SIS-089-R34.60 · Structure no. 02 0127E

Built
1964
61 years old, rebuilt 2003
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
251 ft
4 main spans
Daily traffic
8,000
2015 count
Owner
State
State Highway Agency

About this bridge

S5-S89 & N89-S5 Cn over Interstate 5 is a concrete continuous tee beam carrying S5-S89 & N89-S5 Cn over Interstate 5 in Siskiyou County, California. It was built in 1964 and reconstructed in 2003, so it is 61 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 8,000 vehicles a day, roughly 20% of them trucks, projected to reach 10,582 by 2042. The structure is 251 ft (76.5 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS5-S89 & N89-S5 Cn
CrossesInterstate 5
Location02-SIS-089-R34.60
RouteState Highway 89
Coordinates41.28487, -122.30243
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length251 ft (76.5 m)
Longest span80 ft (24.5 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2015)
Projected traffic10,582 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 S5-S89 & N89-S5 Cn over Interstate 5 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2003.

What condition is S5-S89 & N89-S5 Cn over Interstate 5 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 September 2024.

How much traffic does S5-S89 & N89-S5 Cn over Interstate 5 carry?

About 8,000 vehicles per day (2015 count), of which roughly 20% are trucks.

How long is S5-S89 & N89-S5 Cn over Interstate 5?

The structure is 251 ft (76.5 m) long with a longest span of 80 ft (24.5 m) and a deck 34 ft wide.

Who owns S5-S89 & N89-S5 Cn over Interstate 5?

It is owned by the State Highway Agency.