US Bridges

Buckeye Road over Mariposa Creek

Poor

Mariposa County, California · 2.3 MI S/O Old HWY · Structure no. 40C0036

Built
1947
78 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
200
2005 count
Owner
County
County Highway Agency

About this bridge

Buckeye Road over Mariposa Creek is a steel stringer/multi-beam or girder carrying Buckeye Road over Mariposa Creek in Mariposa County, California. It was built in 1947, so it is 78 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 200 vehicles a day, roughly 3% of them trucks, projected to reach 490 by 2040. The structure is 44 ft (13.4 m) long and 20 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesBuckeye Road
CrossesMariposa Creek
Location2.3 MI S/O Old HWY
RouteCounty Highway 0
Coordinates37.42171, -119.97082
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span40 ft (12.3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2005)
Projected traffic490 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$137,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Buckeye Road over Mariposa Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is Buckeye Road over Mariposa Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Buckeye Road over Mariposa Creek carry?

About 200 vehicles per day (2005 count), of which roughly 3% are trucks.

How long is Buckeye Road over Mariposa Creek?

The structure is 44 ft (13.4 m) long with a longest span of 40 ft (12.3 m) and a deck 20 ft wide.

Who owns Buckeye Road over Mariposa Creek?

It is owned by the County Highway Agency.