"Minnesota has spent $761 million from the state's 2008 Legacy Amendment to clean up and protect lakes and streams, but it's too soon to know whether it's doing any good. But clarity should emerge in the coming years as the state implements a strategic plan tracking changes watershed by watershed, the Office of Legislative Auditor said in a new report Monday. In the meantime, some of the government entities charged with spending the special sales tax funds could do a better job of reporting on how the money is used, the report said. Last year legislators directed the auditor's office to answer questions that have frustrated them since the Legacy Amendment was passed by voters in 2008. Can the state measure the outcomes of the spending on water quality? What good has it done? And is the distribution of the money transparent? By and large, the report concluded, state and local government agencies do pretty well in tracking distribution and keeping the process open to the gaze of the public and the Legislature...The biggest question of all — is the money improving water quality across Minnesota — cannot yet be answered, the auditor's office said. In part that's because it takes many years to change the land-use practices that cause water pollution, and even longer for those changes to show up in water quality. Only now does the state have a strategic plan in place to track such long-term changes, a ten-year cycle of measurements on each of the state's 80 major watersheds. By far, the largest chunk of Clean Water funds — 36 percent — has gone to the state Board of Water and Soil Resources. It has spent $276 million, primarily on buying conservation easements in agricultural regions of the state to protect groundwater and surface waters from nitrate and phosphorus pollution, fixing septic systems and controlling stormwater runoff. The report estimates that those funds have reduced nitrogen and phosphorus pollution by 256,000 pounds a year. But that's only a tiny fraction of the reductions needed to bring the state's waters back to the point where they are swimmable, fishable and drinkable, the report said."