US Bridges

State Route 140 over Merced River

Fair

Mariposa County, California · 10-MPA-140-42.10 · Structure no. 40 0057

Built
2008
17 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
160 ft
1 main span
Daily traffic
1,400
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 140 over Merced River is a steel truss - thru carrying State Route 140 over Merced River in Mariposa County, California. It was built in 2008, so it is 17 years old, younger 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 1,400 vehicles a day, roughly 5% of them trucks, projected to reach 1,172 by 2046. The structure is 160 ft (48.8 m) long and 14 ft wide. If it were closed, the detour would be 105.6 mi (170 km).

Location

Open in Google Maps
CarriesState Route 140
CrossesMerced River
Location10-MPA-140-42.10
RouteState Highway 140
CountyMariposa County
StateCalifornia
Coordinates37.65993, -119.90081
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating80.7 US tons
Inventory rating48.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length160 ft (48.8 m)
Longest span160 ft (48.8 m)
Deck width14 ft (4.2 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2009)
Projected traffic1,172 by 2046
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed105.6 mi (170 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 Merced River built?

It was built in 2008, making it 17 years old in 2025.

What condition is State Route 140 over Merced River 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 Merced River carry?

About 1,400 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is State Route 140 over Merced River?

The structure is 160 ft (48.8 m) long with a longest span of 160 ft (48.8 m) and a deck 14 ft wide.

Who owns State Route 140 over Merced River?

It is owned by the State Highway Agency.