US Bridges

18058: Merced Rive over Merced River

FairPosted for load

Mariposa County, California · 8 MI N of Mariposa Ca · Structure no. 000000000L59879

Built
1927
98 years old, rebuilt 1999
Condition
Fair
inspected August 2024
Type
Suspension
Steel
Length
163 ft
1 main span
Daily traffic
100
2022 count
Owner
Federal
Bureau of Land Management

About this bridge

18058: Merced Rive over Merced River is a steel suspension carrying 18058: Merced Rive over Merced River in Mariposa County, California. It was built in 1927 and reconstructed in 1999, so it is 98 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, projected to reach 200 by 2042. The structure is 163 ft (49.7 m) long and 13 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
Carries18058: Merced Rive
CrossesMerced River
Location8 MI N of Mariposa Ca
RouteFederal Lands Road 0
CountyMariposa County
StateCalifornia
Coordinates37.6044, -119.96762
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating25 US tons
Inventory rating15 US tons

Structure

Structure typeSuspension
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 15
Structure length163 ft (49.7 m)
Longest span160 ft (48.8 m)
Deck width13 ft (3.9 m)
Roadway width10 ft (3.2 m)
Vertical clearance over deck1 ft (0.4 m)

Traffic and service

Average daily traffic100 (2022)
Projected traffic200 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Land Management
Maintained byBureau of Land Management
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$35,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 18058: Merced Rive over Merced River built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1999.

What condition is 18058: Merced Rive 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 August 2024.

How much traffic does 18058: Merced Rive over Merced River carry?

About 100 vehicles per day (2022 count).

How long is 18058: Merced Rive over Merced River?

The structure is 163 ft (49.7 m) long with a longest span of 160 ft (48.8 m) and a deck 13 ft wide.

Who owns 18058: Merced Rive over Merced River?

It is owned by the Bureau of Land Management.