Monthly Water Resource Summary

September, 2018

Precipitation

For September 2018, Indiana’s precipitation was generally above normal, with average temperature above normal. The statewide monthly precipitation average was 162.8 percent of normal. The overall monthly temperature average for Indiana was 70.2 degrees Fahrenheit or 5.0 degrees above normal.

For the month of September, six of the nine climate divisions received above to well above normal precipitation. The northeastern climate division received the lowest (61.8) percentage of normal precipitation for the month; the southeastern climate division received the highest (222.3) percentage of normal precipitation for the month.

For the year to date, all nine climate divisions have received above to well above normal precipitation, ranging from 109.4 percent of normal for the northwestern climate division to 132.7 percent of normal for the southwest climate division. For the 2018 water year, which began October 1, 2017, total precipitation is above normal for all the nine climate divisions (112.0 to 128.8% percent of normal). Beginning January 2017, all nine climate divisions have received above normal precipitation. These range from 109.7 percent in the southwestern division to 123.9 percent for the southeastern division.

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

U. S. Drought Monitor

For September 25, 2018, the U.S. Drought Monitor shows Indiana is not experiencing any drought conditions. The U.S. Seasonal Drought Outlook predicts no drought conditions for the state through the end of December 2018.

Streamflow

Of the twelve streams included in drought reporting since 1999, all twelve streams had stream flow at or well above normal. The Muscatatuck River near Deputy had the highest mean monthly flow at 1216%, and the Kankakee River at Shelby had the lowest mean monthly flow at 106%.

Detailed Information on Streamflow

Lake Michigan

On September 28, 2018, the Lake Michigan-Huron forecasted water level was one inch above the measurement taken on September 28, 2017, and two inches below the measurement taken on August 28, 2018. On September 30, 2018 the Michigan-Huron level was 580.34 feet, which is about 44 inches above the lowest recorded monthly mean level for September set in 1964. Comparison of September monthly mean water levels to the long-term (1918-present) average shows Lake Michigan-Huron water level was about 17 inches above the average. All Lake Michigan-Huron data are referenced to the International Great Lakes Datum 1985.

The Lake Michigan-Huron water level is forecast by the U.S. Army Corps of Engineers to fall four inches through October 28, 2018.

Reservoirs

On October 1, 2018, the water levels for six of the eight reservoirs monitored by the U.S. Army Corps of Engineers were above the normal pool elevation. The deviation from normal pools ranged from -2.0 feet (J.E. Roush) to 5.8 feet (Cecil Harden). 

Two of the three reservoirs monitored by Citizens Energy Group (Morse and Geist) were above their respective normal pool elevations as of October 1, 2018.  The deviation from normal pools ranged from -0.9 feet (Eagle Creek) to 0.28 feet (Morse).

Groundwater Levels

As of October 1, 2018 new water level data was available for all of the nine wells currently monitored.  Of the nine wells monitored, data indicate the groundwater levels for LaPorte 9, Fulton 7, and Morgan 4 are below normal. The mean monthly groundwater level is well above normal for Harrison 8 and above normal for LaGrange 2, Vigo 7, Randolph 3, Posey 3, and Clark 20.

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