US Bridges

Sprowel Creek Road over Sprowel Creek

Fair

Humboldt County, California · 3 MI Sw/O Kimtu RD · Structure no. 04C0030

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
151 ft
3 main spans
Daily traffic
163
2011 count
Owner
County
County Highway Agency

About this bridge

Sprowel Creek Road over Sprowel Creek is a steel stringer/multi-beam or girder carrying Sprowel Creek Road over Sprowel Creek in Humboldt County, California. It was built in 1959, so it is 66 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 163 vehicles a day, roughly 2% of them trucks, projected to reach 325 by 2045. The structure is 151 ft (46 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSprowel Creek Road
CrossesSprowel Creek
Location3 MI Sw/O Kimtu RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.06825, -123.82999
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length151 ft (46 m)
Longest span62 ft (18.9 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic163 (2011)
Projected traffic325 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Sprowel Creek Road over Sprowel Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Sprowel Creek Road over Sprowel 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 Sprowel Creek Road over Sprowel Creek carry?

About 163 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Sprowel Creek Road over Sprowel Creek?

The structure is 151 ft (46 m) long with a longest span of 62 ft (18.9 m) and a deck 29 ft wide.

Who owns Sprowel Creek Road over Sprowel Creek?

It is owned by the County Highway Agency.