US Bridges

CO RD 39 (65th St) over Lykins Gulch

Good

Boulder County, Colorado · 0.8 Miles North of Nelson · Structure no. BC-39-9.0-LG

Built
2012
13 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
741
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD 39 (65th St) over Lykins Gulch is a concrete culvert carrying CO RD 39 (65th St) over Lykins Gulch in Boulder County, Colorado. It was built in 2012, so it is 13 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 741 vehicles a day, roughly 11% of them trucks, projected to reach 889 by 2042. The structure is 22 ft (6.7 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCO RD 39 (65th St)
CrossesLykins Gulch
Location0.8 Miles North of Nelson
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.16463, -105.20195
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3.1 m)
Deck width45 ft (13.7 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic741 (2023)
Projected traffic889 by 2042
Trucks11%
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was CO RD 39 (65th St) over Lykins Gulch built?

It was built in 2012, making it 13 years old in 2025.

What condition is CO RD 39 (65th St) over Lykins 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 CO RD 39 (65th St) over Lykins Gulch carry?

About 741 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is CO RD 39 (65th St) over Lykins Gulch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3.1 m) and a deck 45 ft wide.

Who owns CO RD 39 (65th St) over Lykins Gulch?

It is owned by the County Highway Agency.