US Bridges

State Route 263 over Shasta River

Fair

Siskiyou County, California · 02-SIS-263-56.35 · Structure no. 02 0014

Built
1931
94 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete Continuous
Length
582 ft
2 main spans
Daily traffic
1,200
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 263 over Shasta River is a concrete continuous arch - deck carrying State Route 263 over Shasta River in Siskiyou 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 1,200 vehicles a day, roughly 10% of them trucks, projected to reach 1,800 by 2040. The structure is 582 ft (177.4 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesState Route 263
CrossesShasta River
Location02-SIS-263-56.35
RouteState Highway 263
CountySiskiyou County
StateCalifornia
Coordinates41.82116, -122.59258
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating31.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadHS 15
Structure length582 ft (177.4 m)
Longest span207 ft (63.1 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2015)
Projected traffic1,800 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 State Route 263 over Shasta River built?

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

What condition is State Route 263 over Shasta River 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 2023.

How much traffic does State Route 263 over Shasta River carry?

About 1,200 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is State Route 263 over Shasta River?

The structure is 582 ft (177.4 m) long with a longest span of 207 ft (63.1 m) and a deck 28 ft wide.

Who owns State Route 263 over Shasta River?

It is owned by the State Highway Agency.