US Bridges

State Route 70 over Spanish Creek

Fair

Plumas County, California · 02-PLU-070-42.45 · Structure no. 09 0018

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
286 ft
3 main spans
Daily traffic
6,700
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 70 over Spanish Creek is a prestressed concrete stringer/multi-beam or girder carrying State Route 70 over Spanish Creek in Plumas County, California. It was built in 1964, 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 6,700 vehicles a day, roughly 2% of them trucks, projected to reach 3,673 by 2040. The structure is 286 ft (87.2 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesState Route 70
CrossesSpanish Creek
Location02-PLU-070-42.45
RouteState Highway 70
Coordinates39.94548, -120.95642
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating26.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length286 ft (87.2 m)
Longest span95 ft (28.9 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,700 (2009)
Projected traffic3,673 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 70 over Spanish Creek built?

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

What condition is State Route 70 over Spanish Creek 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 June 2023.

How much traffic does State Route 70 over Spanish Creek carry?

About 6,700 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is State Route 70 over Spanish Creek?

The structure is 286 ft (87.2 m) long with a longest span of 95 ft (28.9 m) and a deck 37 ft wide.

Who owns State Route 70 over Spanish Creek?

It is owned by the State Highway Agency.