US Bridges

County Road 34 over St. Vrain Creek

Poor

Weld County, Colorado · 0.3 MI E of CO RD 17 · Structure no. WEL034.0-017.0A

Built
1960
65 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
294 ft
6 main spans
Daily traffic
1,258
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 34 over St. Vrain Creek is a prestressed concrete tee beam carrying County Road 34 over St. Vrain Creek in Weld County, Colorado. It was built in 1960, so it is 65 years old, older than the Colorado average of 42.2 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 1,258 vehicles a day, roughly 39% of them trucks, projected to reach 1,787 by 2043. The structure is 294 ft (89.6 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 34
CrossesSt. Vrain Creek
Location0.3 MI E of CO RD 17
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.2331, -104.899
Functional classRural Minor Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length294 ft (89.6 m)
Longest span48 ft (14.7 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,258 (2023)
Projected traffic1,787 by 2043
Trucks39%
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 County Road 34 over St. Vrain Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is County Road 34 over St. Vrain 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 June 2024.

How much traffic does County Road 34 over St. Vrain Creek carry?

About 1,258 vehicles per day (2023 count), of which roughly 39% are trucks.

How long is County Road 34 over St. Vrain Creek?

The structure is 294 ft (89.6 m) long with a longest span of 48 ft (14.7 m) and a deck 30 ft wide.

Who owns County Road 34 over St. Vrain Creek?

It is owned by the County Highway Agency.