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CDSN On-Line GIS Maps & Applications --



CDSN has updated its web-GIS maps and apps. Interactive maps are lower bandwidth, let you see geospatial relationships and metadata between monitoring locations and other datasets. Interactive Apps let you filter, measure, analyze, and export GIS data. You can turn on and off layers in both maps and apps.


Click on Image Below to Open an Interactive GIS Map (simple viewer) or GIS App (more advanced).

Layers will become visible active as you zoom-in to areas of interest. Layers may not draw completely, if there are more than 1000 vectors in your view. Zooming into areas of interest will correct this.

CDSN + NWIS/STORET Monitoring Locations, HUC Codes & EcoRegions

Monitoring Locations Basic Interactive Web Map

Monitoring Locations GIS Web Application & Filters

monitoring location GIS Application

2016 CDSN Monitoring Locations & WQCD Colorado Stream Segmentation

Segmentation Basic Interactive Web Map

Segmentation GIS Web Application & Filters

WQCC Regulation 93 303(d)/305(b) & TMDL waters with CDSN Water Quality Monitoring Locations (Nov. 2016)

(Please refer to the 2016 Integrated Water Quality Monitoring and Assessment Report, which includes Colorado's Section 305(b) Report.)

WQCC Reg93/TMDL Basic Interactive Web Map

WQCC Reg93/TMDL Basic Interactive Web Map

2016 CDSN Monitoring Locations &WQCC Regulation 71-74 Phosphorus Control, Regulation 42 Classified Areas

WQCC Reg71-74/Reg42 Basic Interactive Web Map

WQCC Reg71-74/Reg42 GIS Web Application & Filters

The CDSN Web GIS utility concept was developed by leadership in collaboration with Colorado Department of Health and Environment, and U.S. Environmental Protection Agency, Region 8. Its final design and release is coming at a time when the platform ESRI ArcGIS Online is continuing to undergo rapid changes. The purpose of the CDSN Web GIS is to allow for simple GIS queries to be made on CDSN monitoring locations managed in AWQMS and allow for determining geospatial relationships to impaired waters, HUC 8 and HUC 12 codes, ecoregions, waterbody ID, and basins.
This GIS application and its data layers were created by CDSN in cooperation with Water Quality Control Division, EPA, and USGS.  While we used the best available data in our November 2016, we do not guarantee accuracy of data.  Please contact the CDPHE Water Quality Control Division (WQCD) for plan revisions and updates https://www.colorado.gov/pacific/cdphe/wqcc-reports-and-plans and updates to WQCC GIS source data https://www.colorado.gov/pacific/cdphe/clean-water-gis-maps. Metadata, links to original data sources and GIS downloads are available on the tabs above. Please refer to the 2016 Integrated Water Quality Monitoring and Assessment Report, which includes Colorado's Section 305(b) Report.
On the GIS download tab above, CDSN also makes available GIS files for download and use in your own desktop GIS. We anticipate updating our Monitoring Location shapefiles as resources are available.

About the CDSN Web GIS Application --

The CDSN Web GIS Application lets anyone perform basic geo-spatial queries from the online utility. More advanced functions, including using the application in your own desktop GIS environment are available--just see the quick start guides. There are two CDSN-created quick start guides on the application tab, one for those WITH an ESRI ArcGIS Online user account and one for those WITHOUT one. See below for information on how to create a free ESRI Online user account.
CDSN Web GIS Utility allows users to do simple to advanced GIS operations between AWQMS monitoring locations and useful baselayers such as the National Hydrography Dataset (NHD), 8- and 12-digit Hydrologic Unit Codes, EcoRegion III and IV codes; and elements of the CDPHE/WQCD Integrated Water Quality Monitoring and Assessment Report such as 305(b) and 303(d) impaired waters GIS layers. Users can quickly gain additional metadata about AWQMS monitoring locations via pop-up metadata boxes and can also download GIS files (see the download tab) for use in your own desktop GIS system.
This GIS map application and its data layers were created, modified or obtained by CDSN in cooperation with Water Quality Control Division, EPA, and USGS.  While we used the best available data in our November 2016, we do not guarantee accuracy of data.  Please contact the CDPHE Water Quality Control Division (WQCD) for revisions and updates of their programmatic and regulatory data layers.

About ESRI ArcGIS Online, CDSN Superusers, & ESRI Tutorials:

If you already have an ArcGIS Online user account and would like to join our Group to directly access CDSN's content and applications, please contact the CDSN Project Coordinators know and we can send you an invitation.
ArcGIS Online is a collaborative, cloud-based platform that lets members of an organization create, share, and access maps, applications, and data, including authoritative basemaps published by Esri. Through ArcGIS Online, you get access to Esri’s secure cloud, where you can manage, create, store, and access hosted web services, and because ArcGIS Online is an integral part of the ArcGIS system, you can use it to extend the capabilities of ArcGIS for Desktop, ArcGIS for Server, ArcGIS applications, and ArcGIS APIs and Runtime SDKs.
CDSN is providing its Web GIS application so that the public can access specially created and compiled gis layers and monitoring location data. Users can add their own shapefiles, KML files, spreadsheet data, OGC WMS and WMTS services, tile layers, geoRSS files, and GPS files to quickly create mashups with data and maps shared by others. Users can also access the ESRI gallery of ready-to-use, basemaps, map layers and tools, which ESRI keeps updating. CDSN has enabled all of our gis layers, shapefiles, maps and applications to be shared with the public within ArcGIS Online. CDSN updates its data and updates links to other important gis layers at least annually, between April and May, with other updates as needed.
By using ArcGIS Online to publish our CDSN maps, applications and data as web services on ArcGIS Online we are maximizing our partnerships, time and financial resources, since these web services are hosted in Esri’s cloud and Colorado's public and our CDSN data providers to use these services directly from their own ArcGIS 10 for Desktop or the ArcGIS Online website without needing to install, host, and pay for own server. CDSN has set up a group that currently users can join on request. The main CDSN web gis application is accessible by Colorado's water quality community from this web page. For the best performance, it is recommended that you use the latest version of Mozilla Firefox, Google Chrome, Safari, or Internet Explorer (do not use IE 8 or below).
ESRI ArcGIS Online Public Accounts are available for individuals. A public account lets you create, store, and manage maps, apps, and data and share them with others. You also get access to content shared by Esri and GIS users around the world. For more information about getting started with a public account, see the ESRI Quick Start Guide to ArcGIS Online for Public Accounts.
CDSN-created quick start guides explain the differences of using our GIS application with and without an ESRI ArcGIS Online User Account:
CDSN Basic Public Quick Start Guide for using the CDSN WebGIS application withOUT an ArcGIS Online User Account
CDSN Public Quick Start Guide for using the CDSN WebGIS application WITH an ArcGIS Online User Account


Downloadable GIS Files --

The downloadable files are provided as zipped shapefiles for the most versatility. All GIS Files are considered the best available public information as of November 1, 2016. Updates to GIS files occur sporadically as CDSN when resources are available. File sizes are only shown for files > 10mb.
This GIS map application and its data layers were created, modified or obtained by CDSN in cooperation with Water Quality Control Division, EPA, and USGS.  While we used the best available data in November 2016, we do not guarantee accuracy of data. This GIS map application and its data layers were created, modified or obtained by CDSN in cooperation with Water Quality Control Division, EPA, and USGS.  While we use the best available data for each update, CDSN does not guarantee accuracy of data.  Please contact the CDPHE Water Quality Control Division (WQCD) for revisions and updates of their programmatic and regulatory data layers, or the primary agency as noted below. CDPHE's Clean Water: Rivers, Lakes and Streams page contains links to water quality programs and data. CDPHE's Clean Wate: GIS Maps & Data page is the best place to check for updated CDPHE geospatial data files.


Direct Links to CDPHE WQCD Source Data
Fish Advisories (CDPHE Viewer secure viewer only)
CDPHE Clean Water GIS data web page -- DIRECT LINKS to download most current Water Quality Control Division (WQCD) GIS data are below:
Implementation of Clean Water Act Section 303(d) requirements:
  • Regulation 93: Colorado's Section 303(d) List of Impaired Waters and Monitoring and Evaluation List (amended 10/11/16, effective 11/30/16) Report.

Download CDSN 2016 Exports of WQCD Data

Note: CDSN has converted the WQCD ArcGIS geodatabases into ArcGIS shapefiles, exported from WQCD GIS data in Nov. 2016. For the convenience of those who do are unable to use the WQCD geodatabases, we are providing our less current .shp files (Nov. 2016) below. We do not guarantee the accuracy of this information beyond Nov. 2016. Use at your own risk.


2016 Monitoring Locations

CDSN AWQMS Monitoring Locations -- with County, HUC8, and HUC12 codes and organization websites
Active USGS NWIS Water Quality Data Monitoring Locations (Stream, Surface Water, Other Surfical, Groundwater) -- with County, HUC8, and HUC12 codes and weblink to details & data
EPA STOrage and RETrieval and Water Quality eXchange
Data Retrieval

EPA Datasets

EPA Reach Address Database (RAD) info page
EPA Reach Address Database (RAD) ESRI GIS portal
EPA WATERS Geospatial Data Downloads (including ATTAINS, BEACH, WATER QUALITY STANDARDS programs)
EPA STOrage and RETrieval and Water Quality eXchange Data Retrieval

GIS Baselayers

Colorado State Boundary (polygon)
Colorado County Boundary (polygon)
HUC 2 Boundary, Colorado clip (polygon)
HUC 4 Boundary, Colorado clip (polygon)
HUC 6 Boundary, Colorado clip (polygon)
HUC 8 Boundary, Colorado clip (polygon) [6 mb]
HUC 12 Boundary, Colorado clip (polygon) [28 mb], courtesy of USGS, dated July 2013.
EcoRegion III, Colorado clip (polygon)
EcoRegion IV, Colorado clip (polygon)

Helpful Links about the CDSN Map Databases and GIS Layers --





National Hydrography Dataset --
The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.
National Hydrography Dataset Plus (NHDPlus)--
Users are highly encouraged to use the second version of the NHDPlus dataset was released (NHDPlusV2). NHDPlus is an integrated suite of application-ready geospatial data products, incorporating many of the best features of the National Hydrography Dataset (NHD), the National Elevation Dataset (NED), and the National Watershed Boundary Dataset (WBD). NHDPlus includes a stream network based on the medium resolution NHD (1:100,000-scale), improved networking, feature naming, and “value-added attributes” (VAA). NHDPlus also includes elevation-derived catchments produced using a drainage enforcement technique first broadly applied in New England, and thus dubbed “The New-England Method.” This technique involves enforcing the 1:100,000-scale NHD drainage network by modifying the NED elevations to fit with the network via trenching and using the WBD to enforce hydrologic divides, and applying sinks in noncontributing areas1. The resulting modified digital elevation model (DEM) was used to produce hydrologic derivatives that closely agree with the NHD and WBD with a suite of components and enhancements.
EPA Reach Address Dataset (RAD) --
The RAD contains the spatial representation for each Water Program Feature and an associated identifier (also, known as the source_featureid) used to relate the spatial representation to descriptive attributes stored in a separate Water Program database. For example, the Assessed Waters Feature identifier can be used to access attribute information stored in the Assessment and TMDL Tracking and ImplentatioN System (ATTAINS). Water Program Feature datasets for Colorado include:
303(d) Listed Impaired Waters; EPA Metadata, 305(b) Assessed Waters; Clean Watersheds Needs Survey; Fish Consumption Advisories; Nonpoint Source Project; STORET Water Monitoring Locations; Facilities that Discharge to Water; and TMDLs on Impaired Waters.
305(b) Integrated Water Quality Monitoring and Assessment Report and 303(d) Listed Impaired Waters and Monitoring and Evaluation List --
The Environmental Data Unit (EDU) of the Colorado Department of Public Health and Environment (CDPHE) gathers, assesses and reports data regarding the chemical, physical and biological integrity and quality of state surface waters for the Federal Clean Water Act (CWA) as the Integrated Report. The Integrated Water Quality Monitoring and Assessment Report (305(b) report) is the primary vehicle for information about general water quality conditions in the State of Colorado. This document characterizes our water quality, identifies widespread water quality problems of significance, and describes various projects implemented to restore and protect our waters.  Regulation 93 establishes Colorado's List of Water-Quality-Limited-Segments Requiring Total Maximum Daily Loads (TMDLs). This list fulfills Section 303(d) of the federal Clean Water Act, which requires states to submit to the U.S. Environmental Protection Agency (EPA) a list of waters for which technology-based effluent limitations and other required controls aren’t stringent enough to implement water quality standards. Links to CDPHE WQCC/WQCD reports, plans and data, as well as the national program administered by the EPA are below.
EPA Implementing Clean Water Act Section 303(d): Impaired Waters and Total Maximum Daily Loads (TMDLs) & Assessment and Total Maximum Daily Load Tracking and Implementation System (ATTAINS) --
A TMDL is a pollution budget and includes a calculation of the maximum amount of a pollutant that can occur in a waterbody and allocates the necessary reductions to one or more pollutant sources. A TMDL serves as a planning tool and potential starting point for restoration or protection activities with the ultimate goal of attaining or maintaining water quality standards.Under section 303(d) of the Clean Water Act, states, territories and authorized tribes (included in the term State here) are required to submit lists of impaired waters. These are waters that are too polluted or otherwise degraded to meet water quality standards. The law requires that the states establish priority rankings for waters on the lists and develop Total Maximum Daily Loads (TMDL) for these waters. Lists of impaired waters and TMDLs are reviewed in EPA’s regional offices.
The Clean Water Act requires states, territories and authorized tribes (states for brevity) to monitor water pollution and report to EPA every two years on the waters they have evaluated. This process is called assessment. Part of this process is deciding which waters do not meet water quality standards because they are too polluted. These degraded waters are called impaired (polluted enough to require action) and are placed on a State list for future actions to reduce pollution.
This information reported to EPA by states is available in ATTAINS. The information is made available via the ATTAINS web reports, as well as through other EPA tools.
Hydrologic Unit Code (HUC) Dataset --
The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. The hydrologic units are arranged within each other, from the smallest (cataloging units) to the largest (regions). Each hydrologic unit is identified by a unique hydrologic unit code (HUC) consisting of two to eight digits based on the four levels of classification in the hydrologic unit system. HUC basins decrease in size with an increase in levels. Hydrologic Unit Codes (HUC) data describe watersheds as polygons, defined by digital elevation model data. For example, HUC6 watersheds are major river basins while HUC12 watersheds are for 2nd and 3rd order streams. HUC8 codes are required elements describing monitoring locations in the Colorado Data Sharing Network AWQMS data management system.
HUC provides a standardized base for use by water-resources organizations in locating, storing, retrieving, and exchanging hydrologic data, in indexing and inventorying hydrologic data and information, in cataloging water-data acquisition activities, and in a variety of other applications. Because the maps have undergone extensive review by all principal Federal, regional, and State water-resource agencies, they are widely accepted for use in planning and describing water-use and related land-use activities, and in geographically organizing hydrologic data.
General Information -- USGS Hydrologic Unit Maps
Watershed Boundary Dataset (WBD)--
The Watershed Boundary Dataset contains the most current 8-digit, 10-digit and 12-digit HUCs. It is a nationally consistent watershed dataset that is subdivided into 6 levels (12-digit hucs) and is available from the USGS. The WBD contains the most current, the highest resolution and the most detailed delineation of the watershed boundaries.
EcoRegion Datasets --
These datasets are compiled by the EPA to serve as a spatial framework for the research assessment, and monitoring of ecosystems and ecosystem components, ecoregions denote areas within which ecosystems (and the type, quality, and quantity of environmental resources) are generally similar. By recognizing the spatial differences in the capacities and potentials of ecosystems, ecoregions stratify the environment by its probable response to disturbance (Bryce et al. 1999). These general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies, state agencies, and nongovernmental organizations that are responsible for different types of resources within the same geographical areas (Omernik et al. 2000, McMahon et al. 2001). CDSN is including them for reference because EcoRegion codes are accepted by AWQMS as Monitoring Location metadata, and they are required to calculate index scores for biological (macroinvertebrate) sampling under the CDPHE Measurable Results Program. The Measurable Results Program seeks to assist local watershed organizations in scientifically documenting the effects of restoration efforts while helping to enhance the overall quality and quantity of stream restoration monitoring data. 
© Colorado Data Sharing Network/ Colorado Water Quality Monitoring Council 2009-2019; cdsn@coloradowaterdata.org
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