US Bridges

State Route 49 over Mariposa Creek

Fair

Mariposa County, California · 10-MPA-049-19.61 · Structure no. 40 0044

Built
1942
83 years old, rebuilt 1987
Condition
Fair
inspected July 2024
Type
Arch - Deck
Steel
Length
31 ft
2 main spans
Daily traffic
6,600
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 49 over Mariposa Creek is a steel arch - deck carrying State Route 49 over Mariposa Creek in Mariposa County, California. It was built in 1942 and reconstructed in 1987, so it is 83 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 6 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 6,600 vehicles a day, roughly 3% of them trucks, projected to reach 7,031 by 2046. The structure is 31 ft (9.4 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesState Route 49
CrossesMariposa Creek
Location10-MPA-049-19.61
RouteState Highway 49
CountyMariposa County
StateCalifornia
Coordinates37.50196, -119.98851
Functional classRural Minor Arterial

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.
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 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 rating34.6 US tons
Inventory rating23.6 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2009)
Projected traffic7,031 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 49 over Mariposa Creek built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1987.

What condition is State Route 49 over Mariposa 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 49 over Mariposa Creek carry?

About 6,600 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is State Route 49 over Mariposa Creek?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m) and a deck 40 ft wide.

Who owns State Route 49 over Mariposa Creek?

It is owned by the State Highway Agency.