US Bridges

Route 20 over Lower Clear Creek

Fair

Shasta County, California · 1.5 Miles SW of HWY 299 ( · Structure no. 8750002P0000000

Built
1955
70 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
149 ft
3 main spans
Daily traffic
20
2013 count
Owner
Federal
National Park Service

About this bridge

Route 20 over Lower Clear Creek is a steel truss - thru carrying Route 20 over Lower Clear Creek in Shasta County, California. It was built in 1955, so it is 70 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 6 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 20 vehicles a day, roughly 1% of them trucks, projected to reach 20 by 2033. The structure is 149 ft (45.4 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesRoute 20
CrossesLower Clear Creek
Location1.5 Miles SW of HWY 299 (
RouteFederal Lands Road 256
CountyShasta County
StateCalifornia
Coordinates40.58564, -122.55117
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23 US tons
Inventory rating17 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans3
Design loadUnknown
Structure length149 ft (45.4 m)
Longest span80 ft (24.4 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2013)
Projected traffic20 by 2033
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 20 over Lower Clear Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Route 20 over Lower Clear 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 July 2023.

How much traffic does Route 20 over Lower Clear Creek carry?

About 20 vehicles per day (2013 count), of which roughly 1% are trucks.

How long is Route 20 over Lower Clear Creek?

The structure is 149 ft (45.4 m) long with a longest span of 80 ft (24.4 m) and a deck 12 ft wide.

Who owns Route 20 over Lower Clear Creek?

It is owned by the National Park Service.