US Bridges

Henley-Hornbrok RD over Cottonwood Creek

Fair

Siskiyou County, California · 0.10 MI E Hornbrook RD · Structure no. 02C0057

Built
1989
36 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
125 ft
1 main span
Daily traffic
377
2011 count
Owner
County
County Highway Agency

About this bridge

Henley-Hornbrok RD over Cottonwood Creek is a prestressed concrete box beam or girders - multiple carrying Henley-Hornbrok RD over Cottonwood Creek in Siskiyou County, California. It was built in 1989, so it is 36 years old, younger 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 377 vehicles a day, roughly 3% of them trucks, projected to reach 1,109 by 2046. The structure is 125 ft (38.1 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHenley-Hornbrok RD
CrossesCottonwood Creek
Location0.10 MI E Hornbrook RD
RouteCounty Highway 0
Coordinates41.90951, -122.55684
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length125 ft (38.1 m)
Longest span120 ft (36.6 m)
Deck width30 ft (9.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic377 (2011)
Projected traffic1,109 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 Henley-Hornbrok RD over Cottonwood Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Henley-Hornbrok RD over Cottonwood 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 August 2024.

How much traffic does Henley-Hornbrok RD over Cottonwood Creek carry?

About 377 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Henley-Hornbrok RD over Cottonwood Creek?

The structure is 125 ft (38.1 m) long with a longest span of 120 ft (36.6 m) and a deck 30 ft wide.

Who owns Henley-Hornbrok RD over Cottonwood Creek?

It is owned by the County Highway Agency.