US Bridges

State Route 108 over M.I.D. Main Canal

Fair

Stanislaus County, California · 10-STA-108-30.50 · Structure no. 38 0012

Built
1915
110 years old, rebuilt 1994
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
53 ft
3 main spans
Daily traffic
20,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 108 over M.I.D. Main Canal is a concrete continuous slab carrying State Route 108 over M.I.D. Main Canal in Stanislaus County, California. It was built in 1915 and reconstructed in 1994, so it is 110 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 20,200 vehicles a day, roughly 7% of them trucks, projected to reach 34,563 by 2042. The structure is 53 ft (16.2 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesState Route 108
CrossesM.I.D. Main Canal
Location10-STA-108-30.50
RouteState Highway 108
CountyStanislaus County
StateCalifornia
Coordinates37.73267, -120.96872
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span17 ft (5.1 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,200 (2009)
Projected traffic34,563 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 108 over M.I.D. Main Canal built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1994.

What condition is State Route 108 over M.I.D. Main Canal 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 December 2023.

How much traffic does State Route 108 over M.I.D. Main Canal carry?

About 20,200 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 108 over M.I.D. Main Canal?

The structure is 53 ft (16.2 m) long with a longest span of 17 ft (5.1 m) and a deck 44 ft wide.

Who owns State Route 108 over M.I.D. Main Canal?

It is owned by the State Highway Agency.