US Bridges

Thornton Pkwy over Niver Creek

Good

Adams County, Colorado · .25 MI W of I25 · Structure no. THN-THN093-NIV

Built
1990
35 years old
Condition
Good
inspected January 2024
Type
Culvert
Concrete
Length
20 ft
3 main spans
Daily traffic
20,525
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Thornton Pkwy over Niver Creek is a concrete culvert carrying Thornton Pkwy over Niver Creek in Adams County, Colorado. It was built in 1990, so it is 35 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20,525 vehicles a day, roughly 5% of them trucks, projected to reach 26,683 by 2041. The structure is 20 ft (6.2 m) long and 241 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesThornton Pkwy
CrossesNiver Creek
Location.25 MI W of I25
RouteCity Street 0
Coordinates39.86501, -104.994
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length20 ft (6.2 m)
Longest span7 ft (2.1 m)
Deck width241 ft (73.5 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,525 (2021)
Projected traffic26,683 by 2041
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Thornton Pkwy over Niver Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is Thornton Pkwy over Niver Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2024.

How much traffic does Thornton Pkwy over Niver Creek carry?

About 20,525 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Thornton Pkwy over Niver Creek?

The structure is 20 ft (6.2 m) long with a longest span of 7 ft (2.1 m) and a deck 241 ft wide.

Who owns Thornton Pkwy over Niver Creek?

It is owned by the City or Municipal Highway Agency.