US Bridges

State Route 120 over Chinese Creek

Poor

Tuolumne County, California · 10-TUO-120-14.73 · Structure no. 32 0023

Built
1914
111 years old, rebuilt 1968
Condition
Poor
inspected September 2023
Type
Arch - Deck
Concrete
Length
31 ft
1 main span
Daily traffic
2,800
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 120 over Chinese Creek is a concrete arch - deck carrying State Route 120 over Chinese Creek in Tuolumne County, California. It was built in 1914 and reconstructed in 1968, so it is 111 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,800 vehicles a day, roughly 9% of them trucks, projected to reach 5,521 by 2045. The structure is 31 ft (9.5 m) long and 48 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesState Route 120
CrossesChinese Creek
Location10-TUO-120-14.73
RouteState Highway 120
Coordinates37.87772, -120.44904
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length31 ft (9.5 m)
Longest span31 ft (9.5 m)
Deck width48 ft (14.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2009)
Projected traffic5,521 by 2045
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$537,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 120 over Chinese Creek built?

It was built in 1914, making it 111 years old in 2025. It was reconstructed in 1968.

What condition is State Route 120 over Chinese Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does State Route 120 over Chinese Creek carry?

About 2,800 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is State Route 120 over Chinese Creek?

The structure is 31 ft (9.5 m) long with a longest span of 31 ft (9.5 m) and a deck 48 ft wide.

Who owns State Route 120 over Chinese Creek?

It is owned by the State Highway Agency.