US Bridges

County Road 16.5 over Boulder Creek

Fair

Weld County, Colorado · 0.8 MI E of CO RD 1 · Structure no. WEL016.5-001.0B

Built
1983
42 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
127 ft
2 main spans
Daily traffic
572
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 16.5 over Boulder Creek is a prestressed concrete tee beam carrying County Road 16.5 over Boulder Creek in Weld County, Colorado. It was built in 1983, so it is 42 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 572 vehicles a day, roughly 32% of them trucks, projected to reach 812 by 2042. The structure is 127 ft (38.6 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 16.5
CrossesBoulder Creek
Location0.8 MI E of CO RD 1
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.10917, -105.03722
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length127 ft (38.6 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic572 (2022)
Projected traffic812 by 2042
Trucks32%
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 16.5 over Boulder Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is County Road 16.5 over Boulder 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 June 2024.

How much traffic does County Road 16.5 over Boulder Creek carry?

About 572 vehicles per day (2022 count), of which roughly 32% are trucks.

How long is County Road 16.5 over Boulder Creek?

The structure is 127 ft (38.6 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns County Road 16.5 over Boulder Creek?

It is owned by the County Highway Agency.