Agate Lake is a reservoir located 1,510 feet (460 m) above sea level in Jackson County, Oregon, United States. It is 13 miles (21 km) northeast of Medford,[3]
just north of Roxy Ann Peak. The lake is formed by the 86-foot (26 m) tall Agate Dam, which impounds Dry Creek, in the Rogue Riverwatershed.
History
Construction of Agate Dam was authorized in 1962, started in 1965, and completed in 1966.[3][4]
The 86-foot (26 m) tall earth-fill embankment dam was completed by the Talent Division of the Rogue River Basin Project, impounding Dry Creek. Two canals were also built, one a feeder canal diverting seasonal runoff water from Hopkins canal fed from nearby Antelope Creek. The second is the Dry Creek Diversion Canal through which the reservoir water is released at a controlled rate beginning in the summer months supplementing the water supplies of Dry Creek, Antelope Creek, and eventually Little Butte Creek. This water is mainly used for irrigation and the demand for it downstream is normally enough to reduce the reservoir to its minimum allowable level by September each year.[2] A boat ramp, four pit toilets, a picnic area, and a parking lot were also built. All but the boat ramp and parking lot have been removed due to excessive vandalism. There are three parking areas one on the north west side and two on the east side of the lake .[4]
Statistics
Agate Lake receives approximately 23 inches (580 mm) of precipitation annually. Temperatures average from highs of 89 °F (32 °C) in the summer to lows of 22 °F (−6 °C) in the winter. The average wind speed in the area is 10 to 15 miles per hour (16 to 24 km/h).[4]
Agate Lake has an average surface area of 216 acres (0.87 km2), and an average volume of 4,782 acre-feet (5,899,000 m3). It is located 1,510 feet (460 m) above sea level, although the water level fluctuates as much as 25 feet (7.6 m) throughout the year. It has approximately 3 miles (4.8 km) of shoreline. The spillway has a capacity of 3,300 cubic feet per second (93 m3/s).[4]
Agate Dam is 86 feet (26 m) tall, 25 feet (7.6 m) wide, and 3,800 feet (1,200 m) long.[4]
Flora and fauna
An aerial image of Agate Lake
Dry Creek was intermittent prior to the construction of Agate Dam, and did not have any significant fish population.[3] Upstream (to the south of Agate Lake) trees such as willows, cottonwoods, and alders grow in Dry Creek's riparian zone. To the north of Agate Lake blackberries, willows, alders, madrones, white oaks, and ponderosa pine inhabit this zone.[4]
Only non motorized and electric motorboats are allowed on the Lake. Swimming, angling, rock hunting and picnicking are also popular activities.[3]
In the late summer and early fall when the lake recedes you can find agates and petrified wood.
The Jackson County Parks Department estimates that approximately 5,000 people visit the lake annually.[4]
