Big Johnson Reservoir, also known as Fountain Valley Reservoir #2, is located within Bluestem Prairie Open Space in El Paso County, Colorado. The reservoir serves as a municipal water body situated in grassland and prairie habitat east of Colorado Springs.

The lake is recognized as one of the better reservoirs in the area for wildlife observation, particularly during migration periods and winter months when it hosts numerous duck species, gulls, and occasionally loons and grebes.

During migration seasons, shorebirds are also present. The surrounding area supports a resident pronghorn herd, prairie dogs, burrowing owls, and provides habitat for bald eagles and terns.

Access to Big Johnson Reservoir is free and available year-round from dawn to dusk. The site is reached by taking I-25 to the Academy exit (135), heading east/north to Bradley Road, then continuing approximately 4.

4 miles to the Bluestem Open Space parking lot. Note that Bradley Road becomes Goldfield Drive along the route. The location features easy walking trails suitable for those with mobility considerations.

The area maintains a restriction requiring visitors to respect all private property and observe no trespassing signs. Site amenities are limited - there are no restrooms, drinking fountains, or other developed facilities available.

Gravel trails provide access around the reservoir, though paved trails are not present. The reservoir's setting within open prairie provides expansive views and opportunities for wildlife observation beyond just waterfowl.

Winter visits may yield sightings of sparrows and Lapland longspurs around the lake perimeter. The combination of open water and surrounding grassland habitat creates diverse viewing opportunities throughout the year.

Given the municipal ownership and location within open space, visitors should verify current access policies before planning water activities.