US Bridges

Maple Creek RD over Canyon Creek

Fair

Humboldt County, California · 7.25 MI S Intx SR 299 · Structure no. 04C0039

Built
1951
74 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
3 main spans
Daily traffic
55
2011 count
Owner
County
County Highway Agency

About this bridge

Maple Creek RD over Canyon Creek is a steel stringer/multi-beam or girder carrying Maple Creek RD over Canyon Creek in Humboldt County, California. It was built in 1951, so it is 74 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 55 vehicles a day, roughly 10% of them trucks, projected to reach 110 by 2041. The structure is 165 ft (50.3 m) long and 23 ft wide. If it were closed, the detour would be 67.1 mi (108 km).

Location

Open in Google Maps
CarriesMaple Creek RD
CrossesCanyon Creek
Location7.25 MI S Intx SR 299
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.84586, -123.89486
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length165 ft (50.3 m)
Longest span75 ft (22.9 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2011)
Projected traffic110 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed67.1 mi (108 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 Maple Creek RD over Canyon Creek built?

It was built in 1951, making it 74 years old in 2025.

What condition is Maple Creek RD over Canyon 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 October 2023.

How much traffic does Maple Creek RD over Canyon Creek carry?

About 55 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Maple Creek RD over Canyon Creek?

The structure is 165 ft (50.3 m) long with a longest span of 75 ft (22.9 m) and a deck 23 ft wide.

Who owns Maple Creek RD over Canyon Creek?

It is owned by the County Highway Agency.