US Bridges

Maple Creek Road over Boulder Creek

Fair

Humboldt County, California · 1/4 MI E Butler Vly RD · Structure no. 04C0062

Built
1923
102 years old
Condition
Fair
inspected June 2023
Type
Arch - Deck
Concrete
Length
63 ft
1 main span
Daily traffic
106
2011 count
Owner
County
County Highway Agency

About this bridge

Maple Creek Road over Boulder Creek is a concrete arch - deck carrying Maple Creek Road over Boulder Creek in Humboldt County, California. It was built in 1923, so it is 102 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 106 vehicles a day, roughly 5% of them trucks, projected to reach 272 by 2041. The structure is 63 ft (19.3 m) long and 18 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesMaple Creek Road
CrossesBoulder Creek
Location1/4 MI E Butler Vly RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.76126, -123.87349
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length63 ft (19.3 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.4 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic106 (2011)
Projected traffic272 by 2041
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Road over Boulder Creek built?

It was built in 1923, making it 102 years old in 2025.

What condition is Maple Creek Road over Boulder 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 June 2023.

How much traffic does Maple Creek Road over Boulder Creek carry?

About 106 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is Maple Creek Road over Boulder Creek?

The structure is 63 ft (19.3 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns Maple Creek Road over Boulder Creek?

It is owned by the County Highway Agency.