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backwater profile and affect the lake level of upstream Lake Owasso. Currently, no modifications have been made to the Lake Wabasso outlet to increase outflow capacity ~t?~?at w~~tl~e effect nth xt~w:Lgk~ gwasst~ 0ut~~~ tsn ~a1~e ~abasso flood eevat~~n`?~! Summer water quality data has been collected nearly every year on Lake Wabssso for at least two water quality parameters since 1973 (see Table 1-1). The summer averages were used to determine a long-term trend (improving, steady, or degrading) and a water quality action level. As survey level monitoring continues, the most recent summer averages will be compared to the lake's action level. This comparison and the long term trend will be used to determine whether management action is required. In 1999, the summer average transparency was 3.8 meters. The GLWMO set the transparency action level at 2.95 meters. 1.5.3 Snail Lake Snail Lake is a 190-acre lake located in Shoreview. The Category I water body is an important recreational resource that provides swimming, boating, and fishing opportunities. A Ramsey County park on the south side of the lake provides a swimming beach and public access. Snail Lake, like Lake Owasso, is located above the Phalen Channel bedrock valley. As a result, the lake loses large amounts of water to seepage and experiences low lake water levels during periods of below average precipitation. Historically, the lake level was maintained through groundwater pumping. This practice stopped in 1989 when legislation placed lake level augmentation as the lowest priority for groundwater use. In the event of future low water levels, Snail Lake will receive water from Sucker Lake through an augmentation system that was constructed by the Snail Lake Improvement District, Ramsey County, and the city of Shoreview. Snail Lake does not have a normal surface water outlet. In 1993, the city of Shoreview constructed a high overflow outlet under Snail Lake Boulevard to protect adjacent homes from flooding. The lowest adjacent home is approximately 4.5 feet above the normal water elevation of Snail Lake. High water outflows from Snail Lake will flow east to the series of wetlands north of Gramsie Road. Summer water quality data has been collected on Snail Lake for three water quality parameters since 1984 (see Table 1-1). The summer averages were used to determine along-term trend (improving, steady, or degrading) and a water quality action level. As survey level monitoring continues, the most recent summer averages will be compared to the lake's action level. This comparison and the long term trend will be used to determine whether management action is required. In 1999, the Grass Lake WMO Watershed Management Plan 04/25/00 Draft \\NS2\WP\WP\23\62\645\plan\Grass Lake WMO plan.doc Page 1-8