US Bridges

17th Avenue over Spring Gulch

Good

Boulder County, Colorado · 750 Ft E of Whitehall DR · Structure no. LONG-17TH-WHTHL

Built
2000
25 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
49 ft
3 main spans
Daily traffic
9,396
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

17th Avenue over Spring Gulch is a concrete culvert carrying 17th Avenue over Spring Gulch in Boulder County, Colorado. It was built in 2000, so it is 25 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 9,396 vehicles a day, roughly 9% of them trucks, projected to reach 11,275 by 2043. The structure is 49 ft (14.8 m) long and 104 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries17th Avenue
CrossesSpring Gulch
Location750 Ft E of Whitehall DR
RouteCity Street 0
Coordinates40.18881, -105.06417
Functional classUrban Minor 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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
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 rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length49 ft (14.8 m)
Longest span16 ft (4.8 m)
Deck width104 ft (31.8 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,396 (2023)
Projected traffic11,275 by 2043
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 17th Avenue over Spring Gulch built?

It was built in 2000, making it 25 years old in 2025.

What condition is 17th Avenue over Spring Gulch 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 2025.

How much traffic does 17th Avenue over Spring Gulch carry?

About 9,396 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is 17th Avenue over Spring Gulch?

The structure is 49 ft (14.8 m) long with a longest span of 16 ft (4.8 m) and a deck 104 ft wide.

Who owns 17th Avenue over Spring Gulch?

It is owned by the City or Municipal Highway Agency.