Monthly Water Resource Summary

April, 2018

Precipitation

For April 2018, Indiana's precipitation was generally below normal, with average temperature below normal. The statewide monthly precipitation average was 94.4 percent of normal. The overall monthly temperature average for Indiana was 45.3 degrees Fahrenheit or 6.1 degrees below normal.

Four of the nine climate divisions received much above normal precipitation for the month of April. The central climate division received the highest (110.9) percentage of normal precipitation for the month; the north-west climate division received the lowest (65.1) percentage of normal precipitation.

For the 2018 water year, which began October 1, 2017, total precipitation is above normal for all of the nine climate divisions (109.0% to 126.9% percent of normal). Beginning January 2017, all nine climate divisions have received above normal precipitation. These range from 103.9 percent in the southwestern division to 120.3 percent for the southeastern division.

The Standardized Precipitation Index (SPI) long-term 12-month indices shows the southeastern climate division in the "very wet" category; the northwestern, north-central, northeastern, central, east-central and south-central climate divisions in the "moderately wet" category; and the west-central and southwestern climate divisions in the "near normal" category.   The SPI for the 6-month indices shows all of the climate division in the "near normal" category.  The SPI for the 3-month indices shows the southwestern and the south-central climate divisions in the "very wet" category; the northwestern, north-central, west-central, central, east-central and the southeastern climate divisions in the "moderately wet" category; and the northeastern climate division in the "near normal" category.  The SPI for the 1-month indices shows all of the nine climate divisions are in the "near normal" category.

U. S. Drought Monitor

For the period ending April 24, 2018, the U.S. Drought Monitor shows no drought conditions.  The U.S. Seasonal Drought Outlook predicts no drought conditions for the state through the end of July 2018.

Streamflow

Of the twelve streams included in drought reporting since 1999, all had stream flows above to well above normal.  The Whitewater River near Alpine had the highest mean monthly flow at 239% and the Eel River at North Manchester had the lowest mean monthly flow at 101%.

Detailed Information on Streamflow

Lake Michigan

The Lake Michigan-Huron water level for April 27, 2018 was four inches above the measurement taken on April 27, 2017, and four inches above the measurement reported on March 27, 2018.  On April 30, 2018 the Michigan-Huron level was 580.19 feet, which is approximately 48.5 inches above the lowest recorded monthly mean level for April set in 1964. Comparison of April monthly mean water levels to the long-term (1918-present) average shows Lakes Michigan-Huron water levels were slightly greater than 18 inches above the average. All Lake Michigan-Huron data are referenced to the International Great Lakes Datum 1985.

The U.S. Army Corps of Engineers predicts the Lake Michigan-Huron water level to rise about three inches over the next month.

Reservoirs

On April 30, 2018, the water levels for six of the eight Indiana reservoirs being monitored by the U.S. Army Corps of Engineers were above normal pool elevation. The deviation from normal pools ranged from 2.0 feet below (Salamonie) to 31.1 feet above (Cagles Mill).

The water levels of all three reservoirs monitored by Citizens Energy Group (Morse, Geist and Eagle) were above their respective normal pool elevations as of April 30, 2018.  The deviation from normal pools ranged from 0.18 feet (Geist) to 1.28 feet (Eagle Creek).

Groundwater Levels

As of April 30, 2018 new water level data was available for all nine wells currently monitored.  Of the nine wells monitored, data indicate the groundwater levels for LaGrange 2, Vigo 7, Morgan 4 and Posey 3 are above normal for their respective mean monthly level.  The mean monthly groundwater level is near normal for LaPorte 9, Fulton 7, Harrison 8 and Clark 20; to slightly below normal for Randolph 3.

Real-time data are available for all nine observation wells. The real-time information may be accessed on the following U.S. Geological Survey website: http://waterdata.usgs.gov/in/nwis/current/?type=gw

Acknowledgments
This report has been compiled from Division of Water data and from information supplied by the following:

Precipitation data:
National Oceanic and Atmospheric Administration, National Weather Service, Midwestern Regional Climate Center

Standardized Precipitation Index (SPI):
National Drought Mitigation Center (NDMC) and Western Regional Climate Center (WRCC)

Streamflow:
U.S. Geological Survey and State of Indiana cooperative program

Lake Michigan level data:
U.S. Army Corps of Engineers, Detroit District

Reservoir data:
U.S. Army Corps of Engineers, Louisville District

Groundwater level data:
U.S. Geological Survey and State of Indiana cooperative program

Temperature data:
Midwestern Regional Climate Center and Indiana State Climate Office, Purdue University