Monitoring

Monitoring and Reporting

Chatfield Watershed Authority is overseen by the Colorado Department of Public Health & Environment, and the Water Quality Control Commission as are many of the agencies making up the membership of the association. These state agencies provide the regulations, policies and water quality statutes. The Authority is required, by law, to conduct and provide various reports to ensure a consistent and appropriate public health service.The Authority is governed by Regulation No. 73 which outlines the purpose, scope and reporting required. Water quality standards and stream classifications are defined in Regulation No. 38.

Water Quality Updates and Data

The Authority, in coordination with the Chatfield Reallocation Water Providers, conducts water quality monitoring in the Chatfield Reservoir Watershed at six locations:

Chatfield Reservoir – Reservoir Centroid
Chatfield Reservoir -- South Platte Arm
Chatfield Reservoir -- Plum Creek Arm
Plum Creek at Titan Road
South Platte at Waterton Road
Outflow from Chatfield Reservoir

Chatfield Reservoir Water Quality

Water quality compliance at Chatfield Reservoir is based on meeting July-September average concentration of total phosphorus (water quality standard of 30 ug/L) and chlorophyll-a (water quality standard of 10 ug/L). The analyte list is focused on compliance metrics for total phosphorus and chlorophyll- a, in addition to other nutrients (ortho-phosphorus, ammonia, nitrate, and nitrite) and other constituents of concern that demonstrate a healthy reservoir such as dissolved oxygen, total suspended solids, temperature, and specific conductance. All data collected by the Authority is summarized in Annual Master Data Spreadsheets, provided below.

CRMC-CWA Monitoring Amended MOU & SAPChatfield Watershed Compliance Metrics and Total Phosphorus Loads (1983-2010) (excel)

2017 Water Quality Report (excel)

2016 Water Quality Report (excel)

2014 Master Data Spreadsheet (excel)

2013 Master Data Spreadsheet (excel)

2012 Master Data Spreadsheet(excel)

2011 Master Data Spreadsheet (excel)

2010 Master Data Spreadsheet (excel)

2009 Master Data Spreadsheet (excel)

2008 Master Data Spreadsheet (excel)

2007 Master Data Spreadsheet (excel)

2006 Master Data Spreadsheet (excel)

2005 Master Data Spreadsheet (excel)

2004 Master Data Spreadsheet (excel)

2003 Master Data Spreadsheet (excel)

2002 Master Data Spreadsheet (excel)

2001 Master Data Spreadsheet(excel)

2000 Master Data Spreadsheet (excel)

1999 Master Data Spreadsheet (excel)

1998 Master Data Spreadsheet (excel)

1997 Master Data Spreadsheet (excel)

Swim Beach Water Quality

Water quality data from the Swim Beach of Chatfield Reservoir at Chatfield State Park is collected by Colorado State Parks Rangers. The numbers are measured as the number of E. coli organisms per 100 milliliter (ml) sample. The maximum contaminant level allowed by the Colorado Department of Public Health and Environment is 235 organisms of E. coli per 100 ml sample. Sources of E. coli include birds and people. For more information about water quality at the Chatfield swim beach, please contact Park Rangers at 303-791-7275, ext. 114.

Swim Beach Water Quality 2014

Swim Beach Water Quality 2013

Swim Beach Water Quality 2012

Swim Beach Water Quality 2011

Swim Beach Water Quality 2009 (excel)

Swim Beach Water Quality 2009

Swim Beach Water Quality 2007

Swim Beach Water Quality 2006

Plum Creek Watershed Quality

As a recipient of the Healthy Rivers Fund Grant in 2012, the Authority also collected monthly water quality data in the Plum Creek Watershed at ten locations in East Plum Creek, West Plum Creek and the Plum Creek mainstem to better understand potential sources of nonpoint source pollutants in the watershed. Starting in May 2013, Authority member Plum Creek Water Reclamation Authority (PCWRA) has led the monthly sampling and analysis effort. The Plum Creek Watershed Monitoring Network Sampling and Analysis Plan and Plum Creek watershed data are provided below.

Plum Creek Sampling and Analysis PlanPlum Creek Watershed Data (excel)