US Bridges

SR 120 EB over Guthmiller Road

Fair

San Joaquin County, California · 10-SJ-120-R1.33 · Structure no. 29 0271R

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
119 ft
1 main span
Daily traffic
37,500
2009 count
Owner
State
State Highway Agency

About this bridge

SR 120 EB over Guthmiller Road is a prestressed concrete box beam or girders - multiple carrying SR 120 EB over Guthmiller Road in San Joaquin County, California. It was built in 1980, so it is 45 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 37,500 vehicles a day, roughly 19% of them trucks, projected to reach 56,675 by 2041. The structure is 119 ft (36.3 m) long and 42 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR 120 EB
CrossesGuthmiller Road
Location10-SJ-120-R1.33
RouteState Highway 120
CountySan Joaquin County
StateCalifornia
Coordinates37.78916, -121.28751
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating41.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length119 ft (36.3 m)
Longest span118 ft (35.9 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,500 (2009)
Projected traffic56,675 by 2041
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 120 EB over Guthmiller Road built?

It was built in 1980, making it 45 years old in 2025.

What condition is SR 120 EB over Guthmiller Road 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 May 2023.

How much traffic does SR 120 EB over Guthmiller Road carry?

About 37,500 vehicles per day (2009 count), of which roughly 19% are trucks.

How long is SR 120 EB over Guthmiller Road?

The structure is 119 ft (36.3 m) long with a longest span of 118 ft (35.9 m) and a deck 42 ft wide.

Who owns SR 120 EB over Guthmiller Road?

It is owned by the State Highway Agency.