The Bend Parks Board has voted to spend  $100,000 for a study on the silt problem in Mirror Pond.  The District's Executive Director Don Horton says the City of Bend would also pay $100,000 for the study.  Mirror Pond is in danger of becoming mudflats if nothing is done to dredge the two decades of accumulated silt.  The nearby dam slows the water and sediment through the pond causing it to build up.