This section of 51st Street from the main Boulder Reservoir parking area to the Eagle Trail Trailhead (which is also where 51st turns into 55th street) is a fun section of gravel with a nice downhill from the pavement to a short, punchy hill to the trailhead. You get great views over Boulder Valley Ranch to the foothills and Flatirons west and southwest of this section of road.

Jamie S.

October 16, 2023

Road cycling

mtnMan47

August 14, 2025

Cycling

Since the earlier post from October 2023, several new gravel trails have been headed up to and down from the mesa. Flowy routes that are fun.

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Nearby routes

Best routes near 51st Street (Gravel to Eagle Trailhead)

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#1.

Longmont, Boulder Reservoir and Gunbarrel loop via the LOBO Trail

47.4km

03:08

210m

Cycle the moderate 29.4-mile LOBO Trail loop, connecting Longmont, Boulder Reservoir, and Gunbarrel with scenic foothills views.

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Moderate

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#2.

Boulder Valley Ranch and Olde Stage Loop

42.3km

03:01

420m

Cycle the Boulder Valley Ranch and Olde Stage Loop, a moderate 26.3-mile route combining scenic multi-use trails and a challenging road clim

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Moderate

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#3.

Boulder Reservoir loop via 63rd Street, and the Lefthand and Cottonwood Trails

39.6km

02:39

200m

Explore the Boulder Reservoir loop via 63rd Street, Lefthand, and Cottonwood Trails, a moderate 24.6-mile touring cycling route with scenic

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Moderate

Details

Informations

Distance 1.18 km

Uphill 10 m

Downhill 10 m

Weather

Wednesday 22 April

29°C

13°C

-- %

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Location: Boulder, Boulder County, Colorado, United States

Other Popular Places to Check Out

Boulder Reservoir

Cottonwood Trail

Anemone Point Viewpoint

First and Second Flatirons Trail

Lee Hill Drive Climb

Flagstaff Road

South Boulder Peak

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Lefthand Trail

Twin Lakes Trail

Ogallala Road

Centennial Trail

51st Street (Gravel to Eagle Trailhead)

#1.

Longmont, Boulder Reservoir and Gunbarrel loop via the LOBO Trail

#2.

Boulder Valley Ranch and Olde Stage Loop

#3.

Boulder Reservoir loop via 63rd Street, and the Lefthand and Cottonwood Trails

Other Popular Places to Check Out

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