US Bridges

State Route 70 over UP RR

Fair

Lassen County, California · 02-LAS-070-1.16 · Structure no. 07 0026

Built
1953
72 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
185 ft
3 main spans
Daily traffic
4,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over UP RR is a steel continuous stringer/multi-beam or girder carrying State Route 70 over UP RR in Lassen County, California. It was built in 1953, so it is 72 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 4,200 vehicles a day, roughly 6% of them trucks, projected to reach 5,509 by 2040. The structure is 185 ft (56.5 m) long and 32 ft wide. If it were closed, the detour would be 55.3 mi (89 km).

Location

Open in Google Maps
CarriesState Route 70
CrossesUP RR
Location02-LAS-070-1.16
RouteState Highway 70
CountyLassen County
StateCalifornia
Coordinates39.78826, -120.08703
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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length185 ft (56.5 m)
Longest span61 ft (18.7 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2009)
Projected traffic5,509 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed55.3 mi (89 km)
TollOn a free road
National Highway SystemNo

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 State Route 70 over UP RR built?

It was built in 1953, making it 72 years old in 2025.

What condition is State Route 70 over UP RR 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 May 2023.

How much traffic does State Route 70 over UP RR carry?

About 4,200 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 70 over UP RR?

The structure is 185 ft (56.5 m) long with a longest span of 61 ft (18.7 m) and a deck 32 ft wide.

Who owns State Route 70 over UP RR?

It is owned by the State Highway Agency.