Gross Reservoir

Epic Paddleboarding at Gross Reservoir: A Hidden Gem in Boulder, Colorado

Tucked away in the mountainous terrain just southwest of Boulder, Gross Reservoir is one of the area’s most breathtaking and underrated outdoor destinations. This alpine reservoir, stretching across 440 acres, offers a peaceful escape with panoramic views, quiet shorelines, and the perfect environment for stand-up paddleboarding.

Paddleboarding Perfection

Gross Reservoir is a dream come true for paddleboarders. Its vast, calm waters stretch beneath towering pine-covered cliffs and granite outcroppings, providing an ideal playground for exploring in peaceful solitude. The shoreline runs more than 11 miles, giving paddlers room to glide through coves and past dramatic rock walls while soaking in Colorado’s natural beauty. The area is open seasonally to non-motorized boats, offering quiet waters free from the buzz of engines—just the sound of your paddle and the gentle lap of water against your board.

How to Get There

From downtown Boulder, the trip to Gross Reservoir begins by heading west on Baseline Road. Follow it until it becomes Flagstaff Road, and continue winding up the mountains for about 9 miles. Then turn onto Gross Dam Road and follow signs to the reservoir’s south side and the Osprey Boat Launch. The drive itself is an experience, with sweeping views of the foothills and the occasional deer crossing the road.

Once you arrive, there are several access points and trails down to the water. Parking can be limited during peak times, so it’s best to arrive early in the day. Bring your paddleboard, a cooler, and a sense of adventure.

Gross Reservoir

A Bit of History

Gross Reservoir was completed in 1954 and named in honor of Dwight D. Gross, a former chief engineer for Denver’s water system. It was designed as a critical storage and regulation facility for water moving from the Western Slope to the Front Range. The towering concrete dam holds back hundreds of thousands of cubic yards of water and continues to play a vital role in regional water management.

Today, it’s also the site of one of Colorado’s major dam expansion projects, set to increase its height and storage capacity. Once completed, it will be the tallest dam in the state.

What to Know Before You Go

• Seasonal Access: Paddleboarding is permitted from late May through the end of September.

• Be Prepared: Mountain weather changes quickly—bring layers and check the forecast before you go.

• Safety First: Life jackets and safety leashes are recommended for all paddleboarders.

• Leave No Trace: Respect the land, the water, and fellow adventurers by packing out what you pack in.

A Picture-Perfect Moment

Today’s featured photo captures a paddleboard resting on the rocky shoreline, the mirrored water reflecting the deep blue sky and surrounding cliffs. It’s a simple image—but one that speaks volumes about Colorado’s serene wilderness and Boulder’s outdoor lifestyle.

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