The Madison Parks Division says it is fixing boat launch navigation issues at Olbrich Park. W-M-T-V reports as the weather gets warmer people will be boating more and those boaters are being warned to use caution when they are navigating shallow waters. Trouble spots include the narrow channel where Starkweather Creek meets Lake Monona. Sediment in the creek and low water levels are problems. Testing is being done for contaminants before dredging can begin.