US Bridges

State Route 211 over Salt River Overflow

Good

Humboldt County, California · 01-HUM-211-R74.64 · Structure no. 04 0106

Built
1964
61 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
115 ft
4 main spans
Daily traffic
5,700
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 211 over Salt River Overflow is a concrete continuous slab carrying State Route 211 over Salt River Overflow in Humboldt 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,700 vehicles a day, projected to reach 7,753 by 2041. The structure is 115 ft (35.1 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesState Route 211
CrossesSalt River Overflow
Location01-HUM-211-R74.64
RouteState Highway 211
Coordinates40.59291, -124.25026
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating48.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length115 ft (35.1 m)
Longest span32 ft (9.8 m)
Deck width43 ft (13 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2014)
Projected traffic7,753 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 211 over Salt River Overflow built?

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

What condition is State Route 211 over Salt River Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does State Route 211 over Salt River Overflow carry?

About 5,700 vehicles per day (2014 count).

How long is State Route 211 over Salt River Overflow?

The structure is 115 ft (35.1 m) long with a longest span of 32 ft (9.8 m) and a deck 43 ft wide.

Who owns State Route 211 over Salt River Overflow?

It is owned by the State Highway Agency.