| | | | Title: | | | | | Volume/Number: | 2000 | | | | Issuing Agency: | | | | | Description: | Lake Decatur is the water supply reservoir for the City of Decatur. The reservoir was created in 1922 by constructing a dam to impound the flow of the Sangamon River with an original water volume of 20,000 acre-feet and an area of 4.4 square miles. The dam was later modified in 1956 to increase the maximum capacity of the lake to 28,000 acre-feet. Water withdrawal from the lake has been increasing over the years, averaging 37 million gallons per day (mgd) in 1994. The drainage area of the Sangamon River upstream of Decatur is 925 square miles. The watershed includes portions of seven counties in east-central Illinois. The predominant land use in the watershed is row crop agriculture comprising nearly 90 percent of the land area. The major urban areas within the watershed are Decatur, Monticello, and Gibson City. Lake Decatur has high concentrations of total dissolved solids and nitrates, and nitrate concentrations have been exceeding drinking water standards in recent years. This has created a serious situation for the drinking water supply of the City of Decatur. The Illinois Environmental Protection Agency (IEPA) has issued nine nitrate warnings to the city from 1979 to 1996 for noncompliance with Nitrate-N concentrations in Lake Decatur have exceeded the Illinois Environmental Protection Agency (IEPA) drinking water standards for nitrate when concentrations exceeded of 10 milligrams per liter (mg/l) for the period between 1979 and 1998, except from 1993 to 1995. On June 10, 1992, a Letter of Commitment (LOC) was signed between the IEPA and the City of Decatur. The LOC requires the city to take several steps to reduce nitrate levels in Lake Decatur to acceptable concentrations within nine years of signing the LOC. Nitrate-N cannot be removed from finished drinking water through regular water purification processes. One of the steps required the city to conduct an initial two-year monitoring study of the Lake Decatur watershed to better understand nitrate yields in the watershed. In 1993, the Illinois State Water Survey received a grant from the City of Decatur, conducted a two-year monitoring study, and developed land use management strategies that could assist the city comply with the IEPA drinking water standards (Demissie et al., 1996). This technical report presents the annual data for all six years of monitoring (May 1993-April 1999) and monthly data for the sixth year of monitoring (May 1998-April 1999). | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2000-06 | | | | ISL ID: | 000000000831 Original UID: 999999994310 FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | 2002 | | | | Issuing Agency: | | | | | Description: | Lake Decatur is the water supply reservoir for the City of Decatur. The reservoir was created in 1922 by constructing a dam to impound the flow of the Sangamon River. The dam was modified in 1956 to increase the maximum capacity of the lake to 28,000 acre-feet. The drainage area of the Sangamon River upstream of Decatur is 925 square miles and includes portions of seven counties in east-central Illinois. Lake Decatur has high concentrations of total dissolved solids and nitrates, and nitrate-N concentrations have been exceeding drinking water standards in recent years. This has created a serious situation for the drinking water supply of the City of Decatur, since nitrate-nitrogen (N) cannot be removed from finished drinking water through regular water purification processes. Nitrate-N concentrations in Lake Decatur have exceeded the Illinois Environmental Protection Agency (IEPA) drinking water standard of 10 milligrams per liter (mg/l) on occasions each year for the period between 1970 and 2000, except from 1993 to 1995. Since 1993, the Illinois State Water Survey has been monitoring the Lake Decatur watershed for trends in nitrate-N concentrations and loads and to identify any significant changes in the watershed. The purpose of the monitoring is to collect reliable hydrologic and water quality data throughout the watershed for use by city planners and resource managers to develop watershed management alternatives based on scientific data. This report presents the annual data for all seven years of monitoring (May 1993-April 2000) and monthly data for Year 7 of monitoring (May 1999-April 2000). Based on the seven years of data, it can be concluded that the unit of nitrate-N loads are relatively uniform over the entire watershed but tend to be slightly higher at the tributary streams in the upper Sangamon River watershed than at the Sangamon River stations closer to the lake. Nitrate-N loads vary with concentrations and streamflow and were the lowest in Year 7 because of the low streamflows during that year. Flow-weighted nitrate-N concentrations have been increasing during the study period at the Monticello station. The highest nitrate-N concentrations during the monitoring period were observed in years 6 and 7. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2002-01 | | | | ISL ID: | 000000000859 Original UID: 999999994336 FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | 2005 | | | | Issuing Agency: | | | | | Description: | Lake Decatur is the water supply reservoir for the City of Decatur. The reservoir was created in 1922 by constructing a dam to impound the flow of the Sangamon River. The dam was modified in 1956 to increase the maximum capacity of the lake to 28,000 acre-feet. The drainage area of the Sangamon River upstream of Decatur is 925 square miles and includes portions of seven counties in east-central Illinois, which are primarily in agricultural production. Lake Decatur has high concentrations of total dissolved solids and nitrates, and nitrate-nitrogen (nitrate-N) concentrations have been exceeding drinking water standards in recent years. This created a serious situation for the drinking water supply of the City of Decatur because nitrate-N cannot be removed from finished drinking water through regular water purification processes. Nitrate-N concentrations in Lake Decatur have exceeded the Illinois Environmental Protection Agency (IEPA) drinking water standard of 10 milligrams per liter (mg/L) on occasions each year between 1979 and 2002, except in 1993, 1994, 1995, and 2000. In June 2002, the City of Decatur activated a newly constructed nitrate-removal facility. Since 1993, the Illinois State Water Survey has been monitoring the Lake Decatur watershed for trends in nitrate-N concentrations and loads and to identify any significant changes in the watershed. The continued purpose of the monitoring is to collect reliable hydrologic and water quality data throughout the watershed for use by city planners to efficiently operate the nitrate removal facility and by resource managers to develop watershed management alternatives based on scientific data. This report presents annual data for 10 years of monitoring (May 1993-April 2003) and monthly data for Project Years (PYs) 8-10 of monitoring (May 2000-April 2003). Based on these data, it can be concluded that the average unit nitrate-N loads are relatively uniform over the entire watershed, but tend to be slightly higher at the tributary stations than at the Sangamon River stations. There also can be considerable differences in loads at tributary stations from year to year. Nitrate-N loads vary with concentration and streamflow. Average annual runoff has varied from 4 to 14 inches over the monitoring period. Concentrations were lowest in PY 7 and highest in PY 1 due to extremely low and high streamflows, respectively. Flow-weighted nitrate-N concentrations have been increasing at the Monticello and Big Ditch stations during the study period. The highest nitrate-N concentrations during the monitoring period were observed in PY 6 and PY 7. Area-weighted annual nitrate-N yield into Lake Decatur has varied between 10 (1999) and 38 (1998) lb/acre during the 10-year monitoring period (1993-2003). | | | | Date Created: | 4 19 2006 | | | | Agency ID: | CR-2005-09 | | | | ISL ID: | 000000000942 Original UID: 999999994472 FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | 2011 August 19 | | | | Issuing Agency: | | | | | Description: | Tucked back in Happy Hollow underneath the shade is a hidden gem of the Illinois State Fair. Watershed Park is in its eleventh year at the Illinois State Fair and its a fun interactive learning area for kids and adults alike. Watershed Park was designed as an area where the public can learn more about how to protect Illinois water, sustainability and how to incorporate green living into everyday life. | | | | Date Created: | 08 19 2011 | | | | Agency ID: | 954**11 | | | | ISL ID: | 000000037610 Original UID: 18527 FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | This report was the first project in the State of Illinois to combine detailed watershed planning with a Clean Lakes study. Implementing a watershed plan in conjunction with lake restoration activities will greatly enhance the benefits expected from proposed actions by identifying proactive restoration solutions in addition to retroactive restoration solutions. This holistic approach should enhance the outcome of recommendations from this report and help the Lake Carlinville community to understand that watershed management and lake restoration are truly interrelated. | | | | Date Created: | | | | | Agency ID: | | | | | ISL ID: | 000000093419 Original UID: FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | 2007 December | | | | Issuing Agency: | | | | | Description: | This report was the first project in the State of Illinois to combine detailed watershed planning with a Clean Lakes study. Implementing a watershed plan in conjunction with lake restoration activities will greatly enhance the benefits expected from proposed actions by identifying proactive restoration solutions in addition to retroactive restoration solutions. This holistic approach should enhance the outcome of recommendations from this report and help the Lake Carlinville community to understand that watershed management and lake restoration are truly interrelated. | | | | Date Created: | 12 07 2007 | | | | Agency ID: | | | | | ISL ID: | 000000041175 Original UID: 21130 FIRST WORD: Watershed | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | | | | | Date Created: | | | | | Agency ID: | | | | | ISL ID: | 000000043302 Original UID: 22806 FIRST WORD: Watersheds | |
| | | Title: | | | | | Volume/Number: | 2015 July | | | | Issuing Agency: | | | | | Description: | Poster for National Minority Donor Awareness Week, 2015 | | | | Date Created: | 07-17-2015 | | | | Agency ID: | EX 57.1 | | | | ISL ID: | 000000055116 Original UID: 176540 FIRST WORD: Wave | |
| | | Title: | | | | | Volume/Number: | 2018 June | | | | Issuing Agency: | | | | | Description: | National Minority Donor Awareness Week. | | | | Date Created: | 07-12-2018 | | | | Agency ID: | | | | | ISL ID: | 000000101739 Original UID: 207785 FIRST WORD: Wave | |
| | | Title: | | | | | Volume/Number: | 2006 March | | | | Issuing Agency: | | | | | Description: | The Illinois MAIN STREET Program, through the Illinois Historic Preservation Agency, has provided this free design assistance to qualified property/ business owners in the officially designated MAIN STREET project areas. The rendering on this sheet is a conceptual view of the facade renovation based on information supplied to the staff architect. | | | | Date Created: | 03 2006 | | | | Agency ID: | 2005065 | | | | ISL ID: | 000000017218 Original UID: 9278 FIRST WORD: Waves | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2002. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 05 02 2003 | | | | Agency ID: | | | | | ISL ID: | 000000003019 Original UID: 2881 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2003. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 01 31 2004 | | | | Agency ID: | | | | | ISL ID: | 000000002008 Original UID: 1951 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2004. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 01 31 2005 | | | | Agency ID: | | | | | ISL ID: | 000000000405 Original UID: 437 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 01 31 2006 | | | | Agency ID: | | | | | ISL ID: | 000000001048 Original UID: 954 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2006. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 07 25 2007 | | | | Agency ID: | | | | | ISL ID: | 000000020246 Original UID: 10554 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2007. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 09 03 2008 | | | | Agency ID: | | | | | ISL ID: | 000000015789 Original UID: 8578 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2008. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 08 18 2009 | | | | Agency ID: | | | | | ISL ID: | 000000022718 Original UID: 11513 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2009. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 07 26 2010 | | | | Agency ID: | | | | | ISL ID: | 000000030091 Original UID: 13995 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2010. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 07 25 2011 | | | | Agency ID: | | | | | ISL ID: | 000000038839 Original UID: 19399 FIRST WORD: Wayne | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Illinois Taxing District Map for Tax Year 2012. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research. | | | | Date Created: | 09 20 2013 | | | | Agency ID: | | | | | ISL ID: | 000000048126 Original UID: 170244 FIRST WORD: Wayne | |
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