Grand Canyon Monitoring and Research Center

Skip to content

Welcome to the Grand Canyon Monitoring and Research Center

The U.S. Geological Survey's Grand Canyon Monitoring and Research Center (GCMRC) is the science provider for the Glen Canyon Dam Adaptive Management Program. In this role, the research center provides the public and decision makers with relevant scientific information about the status and trends of natural, cultural, and recreational resources found in those portions of Grand Canyon National Park and Glen Canyon National Recreation Area affected by Glen Canyon Dam operations.


We need your help. Become a Citizen Scientist!


Can't see Flash? Install Flash Player or use the HTML version.

Thumbnail image of publication
Three experimental high-flow releases from Glen Canyon Dam, Arizona—Effects on the downstream Colorado River ecosystem1 External Window Icon
Three high-flow experiments (HFEs) were conducted by the U.S. Department of the Interior at Glen Canyon Dam, Arizona, in March 1996, November 2004, and March 2008. Also known as artificial or controlled floods, these scheduled releases of water above the dam’s powerplant capacity were designed to mi...
Thumbnail image of publication
Non-native fish control below Glen Canyon Dam—Report from a structured decision-making project External Window Icon
This report describes the results of a structured decision-making project by the U.S. Geological Survey to provide substantive input to the Bureau of Reclamation (Reclamation) for use in the preparation of an Environmental Assessment concerning control of non-native fish below Glen Canyon Dam. A for...
Thumbnail image of publication
Development of a temperature-dependent growth model for the endangered humpback chub using capture-recapture data External Window Icon
Model derived predictions of fish growth are frequently required for detailed investigations of population dynamics to inform management decisions. Simple growth models are typically fit to paired age and length data, but age data is often not available from endangered species because of restricti...
Thumbnail image of publication
Effects of the 2008 high-flow experiment on water quality in Lake Powell and Glen Canyon Dam releases, Utah-Arizona  External Window Icon
Under the direction of the Secretary of the Interior, the U.S. Geological Survey‘s Grand Canyon Monitoring and Research Center (GCMRC) conducted a high-flow experiment (HFE) at Glen Canyon Dam (GCD) from March 4 through March 9, 2008. This experiment was conducted under enriched sediment conditions ...
Thumbnail image of publication
Aeolian reworking of sandbars from the March 2008 Glen Canyon Dam high-flow experiment in Grand Canyon External Window Icon
The March 2008 high-flow experiment (HFE) replenished many sandbars along the Colorado River corridor in Grand Canyon downstream from Glen Canyon Dam. Some of those sandbars are source areas from which windblown sand moves inland to feed aeolian (wind-formed) sand dunes. Aeolian movement of san...
Thumbnail image of publication
Basal resources in backwaters of the Colorado River below Glen Canyon Dam--Effects of discharge regimes and comparison with mainstem depositional environments External Window Icon
Eight species of fish were native to the Colorado River before the closure of Glen Canyon Dam, but only four of these native species are currently present. A variety of factors are responsible for the loss of native fish species and the limited distribution and abundance of those that remain. These ...
Thumbnail image of publication
Weather and aeolian sand-transport data from the Colorado River corridor, Grand Canyon, Arizona External Window Icon
This report presents measurements of weather parametersand aeolian (windblown) sand transport made in 2008 near selected archaeological sites in the Colorado River corridor through Grand Canyon, Ariz. The quantitative methods and data discussed here form a basis for monitoring ecosystem pro-cesses t...
Thumbnail image of publication
20,000 grain-size observations from the bed of the Colorado River and implications for sediment transport through Grand Canyon External Window Icon
In the late 1990s, we developed digital imaging hardware and software for in-situ mapping of sand-sized bed sediment of the Colorado River in Grand Canyon. This new technology enables collection and processing of hundreds of grain-size samples in a day. Bed grain size was mapped using this equipment...
Thumbnail image of publication
Kanab ambersnail habitat mitigation for the 2008 high flow experiment External Window Icon
The Arizona Game and Fish Department and its Federal partners in ambersnail recovery helped mitigate habitat loss for the endangered Kanab ambersnail (Succineidae: Oxyloma haydeni kanabensis Pilsbry) for the March 2008 High Flow Experiment from Glen Canyon Dam. This mitigation effort was conducte...
Thumbnail image of publication
Development and application of a water temperature model for the Colorado River Below Glen Canyon Dam, Arizona External Window Icon
Filling of Lake Powell upstream from Glen Canyon Dam during the 1970s transformed the seasonally warm Colorado River into a consistently cold river. The loss of seasonal variability in the downstream thermal regime has altered the biota of the river corridor, particularly native fishes and the aquat...

Style: Graphical Version | Text Version

Grand Canyon Monitoring & Research Center | 2255 North Gemini Drive Flagstaff, AZ 86001 | Phone: 928.556.7380 Fax: 928.556.7100

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey | Grand Canyon Monitoring and Research Center

Website Questions:
Maps, Imagery and Data Questions:
Last Update: November 3, 2011