US Bridges

State Route 140 over Miles Creek

Fair

Mariposa County, California · 10-MPA-140-2.89 · Structure no. 40 0013

Built
1928
97 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
24 ft
1 main span
Daily traffic
4,650
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 140 over Miles Creek is a concrete tee beam carrying State Route 140 over Miles Creek in Mariposa County, California. It was built in 1928, so it is 97 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 4,650 vehicles a day, roughly 5% of them trucks, projected to reach 4,688 by 2046. The structure is 24 ft (7.3 m) long and 37 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesState Route 140
CrossesMiles Creek
Location10-MPA-140-2.89
RouteState Highway 140
CountyMariposa County
StateCalifornia
Coordinates37.36316, -120.1774
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
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 inspectionJuly 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,650 (2009)
Projected traffic4,688 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 140 over Miles Creek built?

It was built in 1928, making it 97 years old in 2025.

What condition is State Route 140 over Miles 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 July 2024.

How much traffic does State Route 140 over Miles Creek carry?

About 4,650 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is State Route 140 over Miles Creek?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m) and a deck 37 ft wide.

Who owns State Route 140 over Miles Creek?

It is owned by the State Highway Agency.