US Bridges

County Road 43 over Lone Tree Creek

Fair

Weld County, Colorado · 0.7 MI N of CO RD 70 · Structure no. WEL043.0-070.0C

Built
1981
44 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
570
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 1981, so it is 44 years old, older 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 570 vehicles a day, roughly 41% of them trucks, projected to reach 809 by 2042. The structure is 40 ft (12.1 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 43
CrossesLone Tree Creek
Location0.7 MI N of CO RD 70
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.50388, -104.65899
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length40 ft (12.1 m)
Longest span37 ft (11.3 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic570 (2022)
Projected traffic809 by 2042
Trucks41%
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 1981, making it 44 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 570 vehicles per day (2022 count), of which roughly 41% are trucks.

How long is County Road 43 over Lone Tree Creek?

The structure is 40 ft (12.1 m) long with a longest span of 37 ft (11.3 m) and a deck 32 ft wide.

Who owns County Road 43 over Lone Tree Creek?

It is owned by the County Highway Agency.