Grand Canyon Monitoring and Research Center

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High Flow Experiments

About High Flows


As the science provider to the Glen Canyon Dam Adaptive Management Program, the U.S. Geological Survey's Grand Canyon Monitoring and Research Center (GCMRC) has been instrumental in the planning, timing and monitoring of these events for over twenty years. Past high flow releases from Glen Canyon Dam occurred in years 1996, 2004, 2008, 2012, 2013, 2014 and 2016. To view images of sandbar responses from past high flow experiments (HFE's), please click the Past HFE Photos button below. There is a large amount of information generated around high flow releases, and this page is designed to provide better access to that information through links to other website content, online applications, and relevant publications related to high flow events. Information regarding potential, future high flow releases will be added as it becomes available. Information on the November 5-8, 2018 HFE is available from the Bureau of Reclamation (USBR - HFE Web Page) and the National Park Service (NPS - HFE Web Page). Additional information about HFE's is available at an unofficial website for the Glen Canyon Dam Adaptive Management Program, maintained by stakeholders (GCDAMP - HFE Web Page).

Data and Tools

Grand Canyon Sandbar Monitoring
Discharge, Sediment, and Water Quality Monitoring
Sandbar Deposition Following 2016 High Flow
Sandbar Deposition Following 2014 High Flow
Sandbar Deposition Following 2013 High Flow
Sandbar Deposition Following 2012 High Flow
Sandbar Photo Viewer
Predicted Shorelines for the HFE
GCMRC Base Map Viewer

Publications: High-flow publications since 2008: 32 Titles


Year Published: 2018

Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in the Grand Canyon

Authors: Erich R. Mueller, Paul E. Grams, Joseph E. Hazel, Jr., John C. Schmidt
Document Type: Journal Article
Listed In: GCMRC Library, Sedimentary Geology, ScienceDirect online
Citation: Mueller, E.R., Grams, P.E., Hazel Jr., J.E., and Schmidt, J.C., 2018, Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in Grand Canyon: Sedimentary Geology, v. 363, p. 181-199, https://doi.org/10.1016/j.sedgeo.2017.11.007.


Year Published: 2018

Geomorphology and vegetation change at Colorado River campsites, Marble and Grand Canyons, Arizona 

Authors: Daniel R. Hadley, Paul E. Grams, Matthew A. Kaplinski, Joseph E. Hazel, Roderic A. Parnell
Document Type: Report
Listed In: GCMRC Library, USGS Publications 
Citation: Hadley, D.R., Grams, P.E., Kaplinski, M.A., Hazel, J.E., Jr., and Parnell, R.A., 2018, Geomorphology and vegetation change at Colorado River campsites, Marble and Grand Canyons, Arizona: U.S. Geological Survey Scientific Investigations Report 2017–5096, 64 p., https://doi.org/10.3133/sir20175096.


Year Published: 2018

Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona 

Authors: Daniel R. Hadley, Paul E. Grams, Matthew E. Kaplinski
Document Type: Journal Article
Listed In: GCMRC Library, River Research and Applications, Wiley.com online
Citation: Hadley, D.R., Grams, P.E., and Kaplinski, M.A., 2018, Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona: River Research and Applications, online, https://doi.org/10.1002/rra.3349.


Year Published: 2018

Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona  

Authors: Paul E. Grams, Robert B. Tusso, Daniel Buscombe
Document Type: Journal Article
Listed In: GCMRC Library, USGS Publications
Citation: Grams, P.E., Tusso, R.B., and Buscombe, D., 2018, Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona: U.S. Geological Survey Open-File Report 2018–1019, 50 p., https://pubs.er.usgs.gov/publication/ofr20181019.


Year Published: 2015

Riparian vegetation, Colorado River, and climate: Five decades of spatiotemporal dynamics in the Grand Canyon with river regulation

Authors: Joel B. Sankey, Barbara E. Ralston, Paul E. Grams, John C. Schmidt, Laura E. Cagney
Document Type: Journal Article
Listed In: GCMRC Library
Citation: Sankey, J.B., Ralston, B.E., Grams, P.E., Schmidt, J.C., and Cagney, L.E., 2015, Riparian vegetation, Colorado River, and climate: Five decades of spatiotemporal dynamics in the Grand Canyon with river regulation: Journal of Geophysical Research Biogeosciences, online, https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2015JG002991.


Year Published: 2015

Building sandbars in the Grand Canyon

Authors: Paul E. Grams, John C. Schmidt, David J. Topping, Theodore S. Melis, David M. Rubin
Document Type: Report
Listed In: GCMRC Library
Citation: Grams, P.E., Schmidt, J.C., Wright, S.A., Topping, D.J., Melis, T.S., and Rubin, D.M., 2015, Building sandbars in the Grand Canyon: EOS, v. 96, no. 11, p. 12-16, https://eos.org/features/building-sandbars-in-the-grand-canyon.


Year Published: 2014

Do management actions to restore rare habitat benefit native fish conservation? Distribution of juvenile native fish among shoreline habitats of the Colorado River

Authors: Michael J. Dodrill, Charles B. Yackulic, Brandon Gerig, Josh Korman, C. Finch
Document Type: Journal Article
Listed In: GCMRC Library
Citation: Dodrill, M.J., Yackulic, C.B., Gerig, B., and Finch, C., 2014, Do management actions to restore rare habitat benefit native fish conservation? Distribution of juvenile native fish among shoreline habitats of the Colorado River: River Research and Applications, v. (online), https://onlinelibrary.wiley.com/doi/abs/10.1002/rra.2842.


Year Published: 2014

The influence of controlled floods on fine sediment storage in debris fan-affected canyons of the Colorado River Basin

Authors: Erich R. Mueller, Paul E. Grams, John C. Schmidt, Joseph E. Hazel, Jr., Jason S. Alexander, Matt Kaplinski
Document Type: Journal Article
Listed In: USGS Publicationsy
Citation: Mueller, E.R., Grams, P.E., Schmidt, J.C., Hazel, J.E., Jr., Alexander, J.S., and Kaplinski, M., 2014, The influence of controlled floods on fine sediment storage in debris fan-affected canyons of the Colorado River basin: Geomorphology, v. 226, p. 65-75, https://dx.doi.org/10.1016/j.geomorph.2014.07.029.


Year Published: 2013

Food-web dynamics in a large river discontinuum

Authors: Wyatt F. Cross, Colden V. Baxter, Emma J. Rosi-Marshall, Robert O. Hall Jr., Theodore A. Kennedy, Kevin C. Donner, Holly A. Wellard Kelly, Sarah E. Zahn Seegert, Kathrine Behn, Michael D. Yard
Document Type: Journal Article
Listed In: USGS Publication
Citation: Cross, W.F., Baxter, C.V., Rosi-Marshall, E.J., Hall, R.O., Jr., Kennedy, T.A., Donner, K.C., Wellard Kelly, H.A., Seegert, S.E.Z., Behn, K., and Yard, M.D., 2013, Food-web dynamics in a large river discontinuum: Ecological Monographs, v. 83, no. 3, p. 311-337, https://dx.doi.org/10.1890/12-1727.1.


Year Published: 2012

Estimating recruitment dynamics and movement of rainbow trout (Oncorhynchus mykiss) in the Colorado River in Grand Canyon using an integrated assessment model

Authors: Josh Korman, Steven J.D. Martell, Carl J. Walters, Andrew S. Makinster, Lewis G. Coggins, Michael D. Yard, and William R. Persons
Document Type: Journal Article
Listed In: Canadian Journal of Fisheries and Aquatic Sciences
Citation: Korman, J., Martell, S.J.D., Walters, C.J., Makinster, A.S., Coggins, L.G., Yard, M.D., Persons, W.R., 2012, Estimating recruitment dynamics and movement of rainbow trout (Oncorhynchus mykiss) in the Colorado River in Grand Canyon using an integrated assessment model: Canadian Journal of Fisheries and Aquatic Sciences, v. 69, no. 11, p. 1827-1849, http://www.nrcresearchpress.com/doi/10.1139/f2012-097#.W9oWGWhKhPb.


Year Published: 2011

Effects of Fluctuating Flows and a Controlled Flood on Incubation Success and Early Survival Rates and Growth of Age-0 Rainbow Trout in a Large Regulated River

Authors: Josh Korman, Matthew Kaplinski, Theodore S. Melis
Document Type: Journal Article
Listed In: USGS Publications
Citation: Korman, J., Kaplinski, M., and Melis, T. S. (2011), Effects of Fluctuating Flows and a Controlled Flood on Incubation Success and Early Survival Rates and Growth of Age-0 Rainbow Trout in a Large Regulated River. Transactions of the American Fisheries Society, 140: 487-505. https://doi.org/10.1080/00028487.2011.572015


Year Published: 2011

Ecosystem ecology meets adaptive management: Food web response to a controlled flood on the Colorado River, Glen Canyon

Authors: W. F. Cross, Colden V. Baxter, K. C. Donner, Emma J. Rosi-Marshall, Theodore A. Kennedy, Robert O. Hall Jr., H. A. Wellard-Kelly, R. S. Rogers
Document Type: Journal Article
Listed In: USGS Publications, Ecological Applications
Citation: Cross, W.F., Baxter, C.V., Donner, K.C., Rosi-Marshall, E.J., Kennedy, T.A., Hall, R.O., Jr., Wellard-Kelly, H.A., and Rogers, R.S., 2011, Ecosystem ecology meets adaptive management: Food web response to a controlled flood on the Colorado River, Glen Canyon: Ecological Applications, v. 21, no. 6, p. 2016-2033, https://doi.org/10.1890/10-1719.1.


Year Published: 2011

Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, Arizona

Authors: Theodore S. Melis
Document Type: Report
Listed In: USGS Publications
Citation: Melis, T.S., ed., 2011, Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, Arizona: U.S. Geological Survey Circular 1366, 147 p., https://pubs.usgs.gov/circ/1366/.


Year Published: 2011

Three experimental high-flow releases from Glen Canyon Dam, Arizona—Effects on the downstream Colorado River ecosystem

Authors: Theodore S. Melis, Paul E. Grams, Theodore A. Kennedy, Barbara E. Ralston, Christopher T. Robinson, John C. Schmidt, Lara M. Schmit, Richard A. Valdez, Scott A. Wright
Document Type: Report
Listed In: USGS Publications
Citation: Melis, T.S. Grams, P.E. Kennedy, T.A. Ralston, B.E. Robinson, C.T. Schmidt, J.C. Schmit, L.M. Valdez, R.A. and Wright, S.A. 2011, Three experimental high-flow releases from Glen Canyon Dam, Arizona; effects on the downstream Colorado River ecosystem: U.S. Geological Survey Fact Sheet 2011-3012, 4 p.


Year Published: 2010

2008 High-flow experiment at Glen Canyon Dam—Morphologic response of eddy-deposited sandbars and associated aquatic backwater habitats along the Colorado River in Grand Canyon National Park

Authors: Paul E. Grams, John C. Schmidt, Matthew E. Andersen
Document Type: Report
Listed In: USGS Publications
Citation: Grams, P.E., Schmidt, J.C., and Andersen, M.E., 2010, 2008 High-flow experiment at Glen Canyon Dam; morphologic response of eddy-deposited sandbars and associated aquatic backwater habitats along the Colorado River in Grand Canyon National Park: U.S. Geological Survey Open-File Report 2010-1032, 73 p.


Year Published: 2010

Basal resources in backwaters of the Colorado River below Glen Canyon Dam--Effects of discharge regimes and comparison with mainstem depositional environments

Authors: Katherine E. Behn, Theodore A Kennedy, Robert O. Hall Jr.
Document Type: Report
Listed In: USGS Publications
Citation: Behn, K.E., Kennedy, T.A., and Hall, R.O., Jr., 2010, Basal resources in backwaters of the Colorado River below Glen Canyon Dam—effects of discharge regimes and comparison with mainstem depositional environments: U.S. Geological Survey Open-File Report 2010-1075, 25 p., at https://pubs.usgs.gov/of/2010/1075/.


Year Published: 2010

Sandbar response in Marble and Grand Canyons, Arizona, following the 2008 high-flow experiment on the Colorado River

Authors: Joseph E. Hazel Jr., Paul E. Grams, John C. Schmidt, Matthew A. Kaplinski
Document Type: U.S. Geological Survey Scientific Investigations Report
Listed In: USGS Publications
Citation: Hazel, J.E., Jr., Grams, P.E., Schmidt, J.C., and Kaplinski, M., 2010, Sandbar response in Marble and Grand Canyons, Arizona, following the 2008 high-flow experiment on the Colorado River: U.S. Geological Survey Scientific Investigations Report 2010-5015, 52 p., https://pubs.usgs.gov/sir/2010/5015/


Year Published: 2010

Riparian vegetation response to the March 2008 short-duration, high-flow experiment--implications of timing and frequency of flood disturbance on nonnative plant establishment along the Colorado River below Glen Canyon Dam

Authors: Barbara E. Ralston
Document Type: Library Document
Listed In: GCMRC Library
Citation: Ralston, B.E., 2010, Riparian vegetation response to the March 2008 short-duration, high-flow experiment--implications of timing and frequency of flood disturbance on nonnative plant establishment along the Colorado River below Glen Canyon Dam: U.S. Geological Survey Open-File Report 2010-1022, 30 p., https://pubs.usgs.gov/of/2010/1022/.


Year Published: 2010

Aeolian reworking of sandbars from the March 2008 Glen Canyon Dam high-flow experiment in Grand Canyon

Authors: Amy E. Draut, Joseph E. Hazel Jr., Helen C. Fairley, Christopher R. Brown
Document Type: Library Document
Listed In: GCMRC Library
Citation: Draut, A.E., Hazel, J.E., Jr., Fairley, H.C., and Brown, C.R., 2010, Aeolian reworking of sandbars from the March 2008 Glen Canyon Dam high-flow experiment in Grand Canyon, in Melis, T.S., Hamill, J.F., Bennett, G.E., Coggins, L.G., Jr., Grams, P.E., Kennedy, T.A., Kubly, D.M., and Ralston, B.E., eds., Proceedings of the Colorado River Basin Science and Resource Management Symposium, November 18-20, 2008, Scottsdale, Arizona: U.S. Geological Survey Scientific Investigations Report 2010-5135, 325-331 p.


Year Published: 2010

Grain-size evolution in suspended sediment and deposits from the 2004 and 2008 controlled-flood experiments in Marble and Grand Canyons, Arizona

Authors:
Document Type: Conference Paper
Listed In: Proceedings of the Joint Federal Interagency Conference 2010 : Hydrology and sedimentation for a changing future : existing and emerging issues
Citation: Draut, A.E., Topping, D.J., Rubin, D.M., Wright, S.A., and Schmidt, J.C., 2010, Grain-size evolution in suspended sediment and deposits from the 2004 and 2008 controlled-flood experiments in Marble and Grand Canyons, Arizona, in Joint Federal Interagency Conference on Sedimentation and Hydrologic Modeling, 2010, June 27–July 1, 2010, Las Vegas, Nevada, Proceedings: Advisory Committee on Water Information, CD-ROM.


Year Published: 2010

Riparian vegetation response to the March 2008 short-duration, high-flow experiment—Implications of timing and frequency of flood disturbance on nonnative plant establishment along the Colorado River below Glen Canyon Dam

Authors: Ralston, Barbara E.
Document Type: U.S. Geological Survey Open-File Report
Listed In: GCMRC Library
Citation: Ralston, B.E., 2010, Riparian vegetation response to the March 2008 short-duration, high-flow experiment—Implications of timing and frequency of flood disturbance on nonnative plant establishment along the Colorado River below Glen Canyon Dam: U.S. Geological Survey Open-File Report 2010–1022, 30 p. (Also available at at http://pubs.usgs.gov/of/2010/1022/.)


Year Published: 2010

Short-term effects of the 2008 high-flow experiment on macroinvertebrates in Colorado River below Glen Canyon Dam, Arizona

Authors: Rosi-Marshall, E.J., Kennedy, T.A., Kincaid, D.W., Cross, W.F., Kelly, H.A.W., Behn, K.A., White, Tyler, Hall, R.O., Jr., and Baxter, C.V.
Document Type: U.S. Geological Survey Open-File Report
Listed In: GCMRC Library
Citation: Rosi-Marshall, E.J., Kennedy, T.A., Kincaid, D.W., Cross, W.F., Kelly, H.A.W., Behn, K.A., White, Tyler, Hall, R.O., Jr., and Baxter, C.V., 2010, Short-term effects of the 2008 high-flow experiment on macroinvertebrates in Colorado River below Glen Canyon Dam, Arizona: U.S. Geological Survey Open-File Report 2010–1031, 28 p. (Also available at https://pubs.usgs.gov/of/2010/1031/.)


Year Published: 2010

Evaluating effects of a high-flow event on rainbow trout movement in Glen and Marble Canyons, Arizona, by using acoustic telemetry and relative abundance measures

Authors: Kara D. Hilwig, Andy S. Makinster
Document Type: U.S. Geological Survey Scientific Investigations Report
Listed In: USGS Publications
Citation: DHilwig, K.D., and Makinster, A.S., 2010, Evaluating effects of a high-flow event on rainbow trout movement in Glen and Marble Canyons, Arizona, by using acoustic telemetry and relative abundance measures, in Melis, T.S., Hamill, J.F., Bennett, G.E., Coggins, L.G., Jr., Grams, P.E., Kennedy, T.A., Kubly, D.M., and Ralston, B.E., eds., Proceedings of the Colorado River Basin Science and Resource Management Symposium, November 18-20, 2008, Scottsdale, Arizona: U.S. Geological Survey Scientific Investigations Report 2010-5135, 219-225 p., at https://pubs.usgs.gov/sir/2010/5135/.


Year Published: 2010

Effects of high-flow experiments from Glen Canyon Dam on abundance, growth, and survival rates of early life stages of rainbow trout in the Lees Ferry reach of the Colorado River

Authors: Josh Korman, Matthew A. Kaplinski, Theodore S. Melis
Document Type: U.S. Geological Survey Open-File Report
Listed In: USGS Publications
Citation: Korman, J., Kaplinski, M., and Melis, T.S., 2010, Effects of high-flow experiments from Glen Canyon Dam on abundance, growth, and survival rates of early life stages of rainbow trout in the Lees Ferry reach of the Colorado River: U.S. Geological Survey Open-File Report 2010-1034, 31 p. https://pubs.usgs.gov/of/2010/1034/.


Year Published: 2010

Sediment transport during three controlled-flood experiments on the Colorado River downstream from Glen Canyon Dam, with implications for eddy-sandbar deposition in Grand Canyon National Park

Authors: David J. Topping, David M. Rubin, Paul E. Grams, Ronald E. Griffiths, Thomas A. Sabol, Nicholas Voichick, Robert B. Tusso, Karen M. Vanaman, Richard R. McDonald
Document Type: U.S. Geological Survey Open-File Report
Listed In: USGS Publications
Citation: Topping, D.J., Rubin, D.M., Grams, P.E., Griffiths, R.E., Sabol, T.A., Voichick, Nicholas, Tusso, R.B., Vanaman, K.M., and McDonald, R.R., 2010, Sediment transport during three controlled-flood experiments on the Colorado River downstream from Glen Canyon Dam, with implications for eddy-sandbar deposition in Grand Canyon National Park: U.S. Geological Survey Open-File Report 2010–1128, 111 p. (Also available at https://pubs.usgs.gov/of/2010/1128/.)


Year Published: 2010

2008 High-flow experiment at Glen Canyon Dam benefits Colorado River resources in Grand Canyon National Park

Authors: Theodore S. Melis, David J. Topping, Paul E. Grams, David M. Rubin, Scott A. Wright, Amy E. Draut, Joseph E. Hazel Jr., Barbara E. Ralston, Theodore A. Kennedy, Emma J. Rosi-Marshall, Josh Korman, Kara D. Hilwig, Lara M. Schmit
Document Type: U.S. Geological Survey Fact Sheet
Listed In: USGS Publications
Citation: Melis, T.S., Topping, D.J., Grams, P.E., Rubin, D.M., Wright, S.A., Draut, A.E., Hazel, J.E., Jr., Ralston, B.E., Kennedy, T.A., Rosi-Marshall, E., Korman, J., Hilwig, K.D., and Schmit, L.M., 2010, 2008 High-flow experiment at Glen Canyon Dam benefits Colorado River resources in Grand Canyon National Park: U.S. Geological Survey Fact Sheet 2010-3009, 4 p., at http://pubs.usgs.gov/fs/2010/3009/.


Year Published: 2010

Effects of the 2008 high-flow experiment on water quality in Lake Powell and Glen Canyon Dam releases, Utah-Arizona

Authors: William S. Vernieu
Document Type: U.S. Geological Survey Open-File Report
Listed In: USGS Publications
Citation: Vernieu, W.S., 2010, Effects of the 2008 high-flow experiment on water quality in Lake Powell and Glen Canyon Dam releases, Utah-Arizona: U.S. Geological Survey Open-File Report 2010-1159, 25 p., https://pubs.usgs.gov/of/2010/1159/.


Year Published: 2010

Geomorphic response of sandbars to the March 2008 high-flow experiment on the Colorado River downstream from Glen Canyon Dam

Authors: Paul E. Grams, Joseph E. Hazel Jr., John C. Schmidt, Matthew A. Kaplinski, Scott A. Wright, David J. Topping, Theodore S. Melis
Document Type: Conference Paper
Listed In: USGS Publications
Citation: Grams, P.E., Hazel, J.E., Schmidt, J.C., Kaplinski, M., Wright, S.A., Topping, D.J., and Melis, T.S., 2010a, Geomorphic response of sandbars to the March 2008 high-flow experiment on the Colorado River downstream from Glen Canyon Dam, in Hydrology and sedimentation for a changing future; existing and emerging issues (Joint Federal Interagency Conference 2010--Federal Interagency Hydrologic Modeling, 4th, and Federal Interagency Sedimentation, 9th), Las Vegas, Nev., June 27- July 1, Proceedings: v. ISBN: 978-0-9779007-3-2, CD-ROM.


Year Published: 2009

Kanab ambersnail habitat mitigation for the 2008 high flow experiment

Authors: Jeff A. Sorensen
Document Type: Arizona Game and Fish Department, Nongame and Endangered Wildlife Program Technical Report
Listed In: GCMRC Library
Citation: Sorensen, J.A., 2009, Kanab ambersnail habitat mitigation for the 2008 high flow experiment: Phoenix, Arizona Game and Fish Department, Nongame and Endangered Wildlife Program Technical Report 257, (available at https://www.gcmrc.gov/files/2563/w-2563_2010-08-19-18-25-18-911_Sorensen%20(2009)%20AGF%20Dept%20Draft%202008%20HFE%20KAS%20Habitat%20Mitigation%20Cooperator%20Report.pdf)


Year Published: 2009

2008 Weather and aeolian sand-transport data from the Colorado River corridor, Grand Canyon, Arizona

Authors: Amy E. Draut, Hoda A. Sandossi, Joseph E. Hazel Jr., Timothy Andrews, Helen C. Fairley, Christopher R. Brown, Karen M. Vanaman
Document Type: Report
Listed In: USGS Publications
Citation: Draut and others—2008 Weather and Aeolian Sand-Transport Data from the Colorado River Corridor, Grand Canyon, Arizona—Open-File Report 2009–1190.


Year Published: 2008

Is there enough sand? Evaluating the fate of Grand Canyon sandbars

Authors: Scott A. Wright, John C. Schmidt, Theodore S. Melis, David J. Topping, David M. Rubin
Document Type: Journal Article
Listed In: Geological Society of America Today
Citation: Wright, S.A., Schmidt, J.C., Melis, T.S., Topping, D.J., and Rubin, D.M., 2008, Is there enough sand? Evaluating the fate of Grand Canyon sandbars: Geological Society of America Today, v. 18, no. 8, p. 4–10, doi: 10.1130/GSATG12A.1.


Year Published: 2008

Science activities associated with proposed 2008 high-flow experiment at Glen Canyon Dam

Authors: John F. Hamill
Document Type: Report
Listed In: USGS Publications
Citation: Hamill, J.F., 2008, Science activities associated with proposed 2008 high-flow experiment at Glen Canyon Dam: U.S. Geological Survey Fact Sheet 2008-3011, 2 p., https://pubs.usgs.gov/fs/2008/3011/.

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