Great Lakes Water LevelsJuly 17th, 2014 at 9:05 pm by Bill Steffen under Bill's Blog, News, Weather
Picture from Jack Martin, enjoying the Sleeping Bear Dunes. Lake Michigan/Huron gained another inch last week, bringing it even closer to the long-term average. The other Great Lakes remain above their long-term averages.
Lake Michigan/Huron (one big lake for lake level purposes) is up 4″ in the last month and is up a whopping 15″ in the last year. Since each inch of water represents 390 billion gallons, that means Lake Michigan has added 5.85 trillion gallons of water in just the past year. This is due to a combination of above average precipitation (Grand Rapids has had 9.47″ of rain since June 1, 3.65″ above average) and lower evaporation (lots of ice this past winter). Lake Michigan/Huron is now only 4″ below the long-term average. Lake Superior is up 2″ in the last month and up 14″ in the last year. Superior is now 6″ above the century average and only 6″ below the highest water level ever reached in 1950. Lake Erie is up 1″ in the last month and up 3″ in the past year. Erie is 5″ above the long-term average. Lake Ontario is 4″ above the century average. Lake St. Clair is up 2″ in the last month, up 7″ year-to-year and 3″ above the century average level. Lake Superior’s outflow down the St. Mary’s River into Lake Huron is expected to be above average into August. The outflow our of Lake Erie down the Niagara River is also expected to be above average.
Also, cool picture…mosquito population triples (audio)…shark spotted in Lake Ontario??!!…grain shipments increase on the Great Lakes…July waterspouts on the Great Lakes…cold water lingers in the Great Lakes…heavy rains cause trash to float into Lake Michigan…WSBT gets lake level story right.