US Bridges

County Road 3100 over Leroux Creek

Fair

Delta County, Colorado · 5.4 MI N of SH 92 · Structure no. DEL3100RP60-47A

Built
1984
41 years old, rebuilt 1992
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
159
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 3100 over Leroux Creek is a steel stringer/multi-beam or girder carrying County Road 3100 over Leroux Creek in Delta County, Colorado. It was built in 1984 and reconstructed in 1992, so it is 41 years old, younger than the Colorado average of 42.2 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 159 vehicles a day, roughly 2% of them trucks, projected to reach 180 by 2042. The structure is 36 ft (11.1 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCounty Road 3100
CrossesLeroux Creek
Location5.4 MI N of SH 92
RouteCounty Highway 0
CountyDelta County
StateColorado
Coordinates38.87917, -107.78533
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating41.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (11.1 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic159 (2022)
Projected traffic180 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 3100 over Leroux Creek built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 1992.

What condition is County Road 3100 over Leroux 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 September 2023.

How much traffic does County Road 3100 over Leroux Creek carry?

About 159 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 3100 over Leroux Creek?

The structure is 36 ft (11.1 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns County Road 3100 over Leroux Creek?

It is owned by the County Highway Agency.