US Bridges

County Road 3 over Sullivan Ditch

Fair

Weld County, Colorado · 0.4 MI N of CO RD 12 · Structure no. WEL003.0_012.0A

Built
2003
22 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
2,247
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Road 3 over Sullivan Ditch is a steel stringer/multi-beam or girder carrying County Road 3 over Sullivan Ditch in Weld County, Colorado. It was built in 2003, so it is 22 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 2,247 vehicles a day, roughly 21% of them trucks, projected to reach 3,191 by 2042. The structure is 41 ft (12.6 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 3
CrossesSullivan Ditch
Location0.4 MI N of CO RD 12
RouteCity Street 0
CountyWeld County
StateColorado
Coordinates40.07744, -105.03717
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating44.9 US tons
Inventory rating26.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length41 ft (12.6 m)
Longest span39 ft (12 m)
Deck width35 ft (10.7 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,247 (2022)
Projected traffic3,191 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 3 over Sullivan Ditch built?

It was built in 2003, making it 22 years old in 2025.

What condition is County Road 3 over Sullivan Ditch 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 February 2024.

How much traffic does County Road 3 over Sullivan Ditch carry?

About 2,247 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is County Road 3 over Sullivan Ditch?

The structure is 41 ft (12.6 m) long with a longest span of 39 ft (12 m) and a deck 35 ft wide.

Who owns County Road 3 over Sullivan Ditch?

It is owned by the Town or Township Highway Agency.