US Bridges

County Road 39 over Union Ditch

Fair

Weld County, Colorado · .5 MI N of CO RD 48.5 · Structure no. WEL039.0_048.5A

Built
2003
22 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
67
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 39 over Union Ditch is a steel stringer/multi-beam or girder carrying County Road 39 over Union 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 67 vehicles a day, roughly 59% of them trucks, projected to reach 95 by 2042. The structure is 28 ft (8.6 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty Road 39
CrossesUnion Ditch
Location.5 MI N of CO RD 48.5
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.34222, -104.6965
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length28 ft (8.6 m)
Longest span25 ft (7.7 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic67 (2023)
Projected traffic95 by 2042
Trucks59%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 39 over Union Ditch built?

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

What condition is County Road 39 over Union 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 April 2024.

How much traffic does County Road 39 over Union Ditch carry?

About 67 vehicles per day (2023 count), of which roughly 59% are trucks.

How long is County Road 39 over Union Ditch?

The structure is 28 ft (8.6 m) long with a longest span of 25 ft (7.7 m) and a deck 31 ft wide.

Who owns County Road 39 over Union Ditch?

It is owned by the County Highway Agency.