US Bridges

Steiner Flat Road over Dutton Creek

Poor

Trinity County, California · 3.8 MI NW of SR3 @d.City · Structure no. 05C0238

Built
1950
75 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
100
2011 count
Owner
County
County Highway Agency

About this bridge

Steiner Flat Road over Dutton Creek is a steel stringer/multi-beam or girder carrying Steiner Flat Road over Dutton Creek in Trinity County, California. It was built in 1950, so it is 75 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 100 vehicles a day, projected to reach 107 by 2042. The structure is 39 ft (12 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSteiner Flat Road
CrossesDutton Creek
Location3.8 MI NW of SR3 @d.City
RouteCounty Highway 0
Coordinates40.67501, -122.97048
Functional classRural Local

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length39 ft (12 m)
Longest span38 ft (11.6 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2011)
Projected traffic107 by 2042
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$105,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Steiner Flat Road over Dutton Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Steiner Flat Road over Dutton 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 August 2023.

How much traffic does Steiner Flat Road over Dutton Creek carry?

About 100 vehicles per day (2011 count).

How long is Steiner Flat Road over Dutton Creek?

The structure is 39 ft (12 m) long with a longest span of 38 ft (11.6 m) and a deck 17 ft wide.

Who owns Steiner Flat Road over Dutton Creek?

It is owned by the County Highway Agency.