US Bridges

County Road 43 over Lone Tree Creek

Fair

Weld County, Colorado · 0.1 MI N of CO RD 74 · Structure no. WEL043.0-074.1A

Built
1985
40 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
562
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 43 over Lone Tree Creek is a steel stringer/multi-beam or girder carrying County Road 43 over Lone Tree Creek in Weld County, Colorado. It was built in 1985, so it is 40 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 5 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 562 vehicles a day, roughly 44% of them trucks, projected to reach 799 by 2042. The structure is 39 ft (12 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 43
CrossesLone Tree Creek
Location0.1 MI N of CO RD 74
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.5245, -104.65875
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length39 ft (12 m)
Longest span36 ft (11 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic562 (2022)
Projected traffic799 by 2042
Trucks44%
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

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 43 over Lone Tree Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is County Road 43 over Lone Tree 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 May 2024.

How much traffic does County Road 43 over Lone Tree Creek carry?

About 562 vehicles per day (2022 count), of which roughly 44% are trucks.

How long is County Road 43 over Lone Tree Creek?

The structure is 39 ft (12 m) long with a longest span of 36 ft (11 m) and a deck 32 ft wide.

Who owns County Road 43 over Lone Tree Creek?

It is owned by the County Highway Agency.