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.

mtnMan47

August 14, 2025

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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Details

Informations

Distance 1.18 km

Uphill 10 m

Downhill 10 m

Weather

Thursday 11 December

18°C

10°C

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Location: Boulder, Boulder County, Colorado, United States

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51st Street (Gravel to Eagle Trailhead)

1. Boulder Reservoir and Olde Stage Road Figure-8 via the Left Hand Trail — Boulder

2. Longmont, Boulder Reservoir and Gunbarrel loop via the LOBO Trail — Boulder

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

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