in the Springbrook Nature Center , Fridley
STORET SiteID = SpringBrook_SpringbrookNatureCen

Notes:

Springbrook Impoundment receives storm water from its urbanized watershed and as a result has intense water level fluctuations and poor water quality. A Clean Water Partnership project has been underway in recent years to try to improve water quality and reduce the intensity of storm water events. This project is ending in 2006. As part of this project a drawdown of this impoundment was underway in 2002-04 to try to re-establish aquatic vegetation that had been decimated by periodic high water and heavy siltation. In 2005 water levels were allowed to return to normal, higher levels.

In 2005, and in the past, this impoundment was flashy. During isolated rain events of >1 inch in 24 hours impoundment water levels increased an average of 0.84 feet per inch of rainfall received (annual averages were 2002 – 0.66, 2003 – 1.08, 2004 – 0.92, 2005 -0.68, with n=3 or 4 each year). Notable storm events with dramatic impoundment responses include a 5.32 inch storm (50-year event) on June 25, 2003 when impoundment levels increased 3.76 feet and returned to pre-storm levels within 32 hours. A 3.52 inch storm on September 21, 2005 caused impoundment water levels to increase 2.44 feet.

*Note: Not all monitored years are listed. Please refer to mapping utility for complete data.