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Hints For Using This Map

Map Hints
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If you ever become confused about where you are on this map, click on the Home icon in the upper left corner of the map viewer to return to the default map extent.

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Map Legend

To display a popup window with the map legend, click on the Legend icon in the upper right corner of the map viewer. Note that map layers only appear in the map legend when they are turned on and the map is zoomed to within the layer's range of visibility adjustment (see Map Layers, below).

Basemaps provide the base layer of detail to the map. You can change the basemap by clicking on the Basemap Gallery icon in the upper right corner of the map viewer. This opens a popup menu with multiple basemap options. Scroll down through the alphabetically arranged list of options.


By default, the map viewer opens with the OpenStreetMap basemap. This basemap provides an economical display of road and place name information, allowing you to quickly get oriented. It also provides the most accurate non-photographic illustration of the hydrographic features of the Yampa River floodplain.


Once you have panned and zoomed to a particular area of interest, try changing your basemap to satellite imagery. "Imagery hybrid" basemaps also provide some level of feature labeling (roads and place names) on top of the base imagery. For most purposes, the best imagery option is the NAIP Imagery Hybrid basemap, which provides the most up-to-date satellite imagery available (currently the fall of 2021).

If your preference is to see topographic lines as your basemap, try changing to the USGS National Map option. This provides a less cluttered display (and more accurate topographic lines) than the "USA Topo Maps" option. Unfortunately, for both of these choices the hydrographic features of the Yampa River floodplain have not been updated for many decades, and are no longer accurately depicted.

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Map Layers

Map layers provide additional detail on top of the basemap. The YRLSP data is displayed in map layers. To see the full list of available map layers, click on the Layer List icon in the upper right corner of the map. You can turn individual map layers on or off using the check boxes in the popup list. By default, the first five YRLSP data layers are turned on, while the Invasion Risk layer and the three Administrative Boundaries layers are turned off.


Sliders for adjusting the transparency and visibility range of each layer can also be found by clicking on the three dots at the end of the layer's name in the Layer List. The greater the transparency of a layer, the more detail that can show through from underlying layers and the basemap. Note that large areas of underlying color will influence the colors of semitransparent layers, so they may not appear as depicted in the map legend.

Popup Windows

Clicking on individual features displayed in the map layers will open a popup window with the data fields populated for the selected feature(s). Note that if you clicked on a location with multiple overlapping features, the popup window will include a page for each selected feature—zooming in before clicking on individual features will allow you to be more selective.


Data field tables for an entire map layer can also be viewed by clicking on the up arrow at the center bottom of the map viewer. Each layer will then appear as a separate tab (if it is currently turned on in the Layer List). Select the tab for the data field table you wish to view. 

Data Layers

Do you have questions about what the various data fields represent? Data field guides are available HERE.

Map Layer Descriptions

River Miles

River Miles mark the distance upstream from the confluence of the Yampa and Green rivers in Dinosaur National Monument, measured along the center of the river channel as it existed in 2019. To avoid clutter, by default this layer is only visible on the map at higher zoom levels. 

Biocontrol Releases

This layer represents the YRLSP's reconstruction of the history of biological control insect releases in Moffat and Routt counties, from the earliest known release in 1989 through 2023. Prior to the past decade accurate recordkeeping was often neglected, so the accuracy of some of the earliest "legacy" release data may be questionable (legacy releases are those made before the YRLSP began keeping its own records in 2019). For more information, see our Biological Control pages. 

Biocontrol Monitoring

The Biocontrol Monitoring data layer compiles all of the biological control site monitoring data collected by the YRLSP. The YRLSP has followed a site monitoring protocol for most of the biological control releases it has conducted (either independently or in coordination with one of our agency partners). Site monitoring data has also been collected for 24 of the legacy release sites located in the Yampa River corridor (representing 26 release records). For more information, see our Biological Control pages.

YRLSP Spurge Mapping (Public)

This layer compiles the 2019–2023 YRLSP leafy spurge mapping data collected on both public and private properties for which the YRLSP has received permission for publication to the general public. It is the same data layer displayed on our downloadable PDF maps. For more information, see our Field Mapping pages.

Dinosaur National Monument Spurge Mapping

Dinosaur National Monument conducted an inventory of leafy spurge infestations within its boundaries during 2016–2018. This data layer compiles those results. It is the same data layer displayed on our downloadable PDF maps. For more information, see our Field Mapping pages.

Invasion Risk Model

This layer represents the invasion risk data developed by University of Wyoming PhD candidate Chloe Mattilio. For ease of display in the YRLSP interactive map application, the original data has been converted to polygons representing four discrete categories of risk. For more information, see the Invasion Risk Modeling section of our Research pages.

Administrative Boundaries (County)

Turning on the Administrative Boundaries (County) layer displays the Moffat and Routt county boundaries. County boundaries already appear in many of the basemap options, but turning on this layer will increase their visibility in the map viewer.

Administrative Boundaries (State)

Turning on the Administrative Boundaries (State) layer displays the State Land Board units (state trust lands), as well as Colorado Parks and Wildlife units (state parks, state wildlife areas, and state trust lands with CPW-leased public recreation access). This layer is limited in extent to Moffat and Routt counties.

Administrative Boundaries (Federal)

Turning on the Administrative Boundaries (Federal) layer displays the Bureau of Land Management, National Park Service, US Forest Service, and US Fish and Wildlife Service administrative units. With the exception of Dinosaur National Monument, this layer is also limited in extent to Moffat and Routt counties.

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