US Bridges

Alderpoint Road over Burr Creek

Fair

Humboldt County, California · 4 MI S of SR 36 · Structure no. 04C0093

Built
1960
65 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
159 ft
3 main spans
Daily traffic
173
2015 count
Owner
County
County Highway Agency

About this bridge

Alderpoint Road over Burr Creek is a steel stringer/multi-beam or girder carrying Alderpoint Road over Burr Creek in Humboldt County, California. It was built in 1960, so it is 65 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 173 vehicles a day, roughly 4% of them trucks, projected to reach 339 by 2046. The structure is 159 ft (48.4 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesAlderpoint Road
CrossesBurr Creek
Location4 MI S of SR 36
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.43566, -123.76922
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 12 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 alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length159 ft (48.4 m)
Longest span51 ft (15.6 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic173 (2015)
Projected traffic339 by 2046
Trucks4%
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 Alderpoint Road over Burr Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Alderpoint Road over Burr 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 February 2024.

How much traffic does Alderpoint Road over Burr Creek carry?

About 173 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Alderpoint Road over Burr Creek?

The structure is 159 ft (48.4 m) long with a longest span of 51 ft (15.6 m) and a deck 29 ft wide.

Who owns Alderpoint Road over Burr Creek?

It is owned by the County Highway Agency.