US Bridges

N. 63rd ST (CR39) over Leggett Ditch

Good

Boulder County, Colorado · 0.4 MI N of SH7 · Structure no. BOLD-39-N63RD-A

Built
2015
10 years old
Condition
Good
inspected February 2025
Type
Culvert
Concrete
Length
46 ft
3 main spans
Daily traffic
3,275
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

N. 63rd ST (CR39) over Leggett Ditch is a concrete culvert carrying N. 63rd ST (CR39) over Leggett Ditch in Boulder County, Colorado. It was built in 2015, so it is 10 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 3,275 vehicles a day, roughly 25% of them trucks, projected to reach 3,929 by 2043. The structure is 46 ft (13.9 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN. 63rd ST (CR39)
CrossesLeggett Ditch
Location0.4 MI N of SH7
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.01988, -105.20663
Functional classUrban Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating52.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length46 ft (13.9 m)
Longest span15 ft (4.5 m)
Deck width44 ft (13.5 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,275 (2023)
Projected traffic3,929 by 2043
Trucks25%
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

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 N. 63rd ST (CR39) over Leggett Ditch built?

It was built in 2015, making it 10 years old in 2025.

What condition is N. 63rd ST (CR39) over Leggett Ditch 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 February 2025.

How much traffic does N. 63rd ST (CR39) over Leggett Ditch carry?

About 3,275 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is N. 63rd ST (CR39) over Leggett Ditch?

The structure is 46 ft (13.9 m) long with a longest span of 15 ft (4.5 m) and a deck 44 ft wide.

Who owns N. 63rd ST (CR39) over Leggett Ditch?

It is owned by the City or Municipal Highway Agency.