US Bridges

Draper Mine RD over Curtis Creek

Fair

Tuolumne County, California · 1 MI S from SH 108 · Structure no. 32C0028

Built
1937
88 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
783
2015 count
Owner
County
County Highway Agency

About this bridge

Draper Mine RD over Curtis Creek is a steel stringer/multi-beam or girder carrying Draper Mine RD over Curtis Creek in Tuolumne County, California. It was built in 1937, so it is 88 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 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 783 vehicles a day, roughly 2% of them trucks, projected to reach 830 by 2046. The structure is 28 ft (8.5 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesDraper Mine RD
CrossesCurtis Creek
Location1 MI S from SH 108
RouteCounty Highway 0
CountyTuolumne County
StateCalifornia
Coordinates37.98105, -120.2721
Functional classRural Minor Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.9 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span24 ft (7.4 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic783 (2015)
Projected traffic830 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Draper Mine RD over Curtis Creek built?

It was built in 1937, making it 88 years old in 2025.

What condition is Draper Mine RD over Curtis 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 May 2024.

How much traffic does Draper Mine RD over Curtis Creek carry?

About 783 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Draper Mine RD over Curtis Creek?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.4 m) and a deck 23 ft wide.

Who owns Draper Mine RD over Curtis Creek?

It is owned by the County Highway Agency.