Granite Bay is the southwest corner of Folsom Lake State Recreation Area and the closest real beach to Sacramento. Douglas Boulevard runs east out of Roseville and ends at the entrance kiosk, and past it a set of large paved lots steps down toward a long crescent of sand that is the biggest developed beach on the lake. On a hot Saturday in July the lots are full by ten in the morning and the parking attendants turn cars away, which tells you most of what you need to know about how the Sacramento valley treats a hundred degree afternoon.

The lake behind the beach was made by Folsom Dam, which the Bureau of Reclamation completed in 1955 across the American River for flood control, water supply and power. At full pool it covers about 11,450 acres with something like 75 miles of shoreline, filling the canyons of the North and South forks of the American. California State Parks runs the recreation area, and lifeguards staff the Granite Bay beach during the summer season, which is unusual for this lake; most of the other shoreline access here is unguarded.

There is a day use fee per vehicle, generally in the range of ten to fourteen dollars depending on season, collected at the kiosk. The beach has restrooms, changing facilities, shade ramadas, picnic sites with grills and a snack concession in peak season, and the Granite Bay boat launch is just south of it with lanes that stay usable later into the drawdown than the ramps at Brown's Ravine or Folsom Point. Boats entering the lake go through a quagga and zebra mussel inspection, so allow time if you are trailering.

Water level is the thing to check before you come. Folsom is a working flood control reservoir with a large seasonal swing, and in a dry year the lake can drop far enough that the waterline retreats hundreds of yards from the developed beach, leaving a walk across cracked lakebed, exposed stumps and old foundations to reach water. Several of the widely circulated photographs of Granite Bay show exactly that, taken in the drought years. In a normal spring the lake fills and the beach is as advertised. The state parks conditions page and the Reclamation daily reservoir report both post the current elevation.

The water is American River snowmelt held over from spring, so it starts cold and warms through the season into the mid 70s by August, clear over a sand and decomposed granite bottom. The bay itself is broad and shallow near shore, which makes it reasonable for kids inside the swim area, and afternoon wind kicks up a light chop.

The land side is worth an hour too. The Pioneer Express Trail runs from Granite Bay along the lake's western shore, open to hikers, runners and horses, and links south into the American River Parkway system that continues toward Sacramento. Beeks Bight, just north of the main beach, has oak woodland, spring wildflowers and quieter shoreline coves, and the ridge behind the beach gives a long view east to the Sierra foothills and, on a clear winter day, the snow line beyond.