The Grand Canyon Monitoring and Research Center currently functions under a Triennial Work Plan (TWP) which is thoroughly reviewed and vetted both internally within the Center and through the GCDAMP Technical Work Group (TWG) and the Adaptive Management Work Group (AMWG). These advisory panels have been a part of the Glen Canyon Dam adaptive management process since the inception of the GCDAMP. For more information on the adaptive management process, please see the GCDAMP Page.
Physical Resources
GCMRC has on-going monitoring and research focused on river sediment dynamics, long-term monitoring of sediment resources in the Colorado River corridor, and understanding the connectivity of sand resources throughout the system.
Biological Resources
Several GCMRC projects focus on understanding the biological processes of the Colorado River, the effect of dam operations on both native and nonnative species, population dynamics of important species, and the terrestrial-biological interactions.
Socio-Economic and Cultural
GCMRC is also concerned with understanding the socio-economic values of the Colorado River in Grand Canyon, the unique recreational opportunites this environment offers and the cultural significance observed by the Tribal people of this the region.
Administrative History and Guidance That Informs GCMRC Projects
The work plan for fiscal years 2018 to 2020 (FY18-20 TWP) is compromised of eleven active science projects that align with the needs of the GCDAMP stakeholders. Each project described in the FY2018–20 TWP is organized around monitoring and research themes that are associated with the eleven resource goals identified in the LTEMP ROD: archaeological and cultural resources, natural processes, humpback chub, hydropower and energy, other native fish, recreational experience, sediment, tribal resources, rainbow trout fishery, nonnative invasive species, and riparian vegetation (U.S. Department of the Interior, 2016a; Attachment A).
The monitoring and research projects are responsive to guidance provided in the LTEMP ROD, which, in addition to identifying the priority resources, also identifies flow and non-flow experimental actions and compliance obligations for Glen Canyon Dam operations for the 20 years of the LTEMP. Additional guidance comes from the Science Plan developed by GCMRC (VanderKooi and others, 2017) in support of the LTEMP ROD which describes a general strategy for monitoring and research needed in support of implementation of operations and experimental actions.
Projects in the current TWP have been informed by and build upon previous research and monitoring projects that were responsive to guidance vetted through the GCDAMP and the Secretary of Interior’s office. While the LTEMP ROD defines broad resource goals and identifies new experimental actions and compliance requirements, some of the older guidance continues to have relevance for certain aspects of the current science program and continues to influence current research and monitoring directions in a general sense. Among this older guidance, the following documents describe the history of GCDAMP decisions and direction and help maintain continuity with GCDAMP goals as LTEMP is implemented:
- 2001 Glen Canyon Dam Adaptive Management Program draft strategic plan (Glen Canyon Dam Adaptive Management Program, 2001),
- 2007 Strategic Science Plan and Strategic Science Questions (SSQs) (U. S. Geological Survey, 2007),
- 2011 draft Core Monitoring Plan (U. S. Geological Survey, 2011), and
- 2012 AMWG Desired Future Conditions.
Monitoring and research themes described in these and other GCDAMP administrative documents have persisted throughout the life of the GCDAMP and are carried forward into the LTEMP. They include:
(1) recovery of the endangered humpback chub (Gila cypha) and maintenance of populations of other native fish;
(2) maintenance or improvement of the physical template, especially regarding fine sediment;
(3) maintenance of culturally important sites, especially those that are of archaeological and historical significance under the National Historic Preservation Act
(4) maintenance of the food base on which the native fish community depends;
(5) maintenance of a high-quality sport fishery in the Lees Ferry reach; and
(6) maintenance of the native riparian vegetation community.
The various goals, questions, information needs, and desired future conditions developed by GCDAMP committees also recognize the importance of maintaining high quality opportunities and conditions for recreational boaters and campers, and the role played by nonnative riparian vegetation in providing habitat for some desired fauna such as the endangered Southwestern willow flycatcher.
Below are on-going science projects associated with GCMRC for the current 3-year work plan (FY2018 - 2020).
River Sediment Dynamics
River Geomorphology and Geomorphic Change
Sediment Storage in Grand Canyon
River Campsites in Grand Canyon National Park
Geospatial Science and Technology
Overview of Riparian Vegetation in Grand Canyon
Rainbow Trout Abundance and Movement in the Colorado River in Grand Canyon
Uncovering the Base of the Food Web: Primary Production Dynamics in the Colorado River
Population Dynamics of Endangered Humpback Chub in Grand Canyon
Understanding Factors Influencing Rainbow Trout Growth in the Colorado River
Connectivity of Sand Resources Along the Colorado River in Grand Canyon
Riparian Remote Sensing in the Colorado River and Grand Canyon Region
- Overview
The Grand Canyon Monitoring and Research Center currently functions under a Triennial Work Plan (TWP) which is thoroughly reviewed and vetted both internally within the Center and through the GCDAMP Technical Work Group (TWG) and the Adaptive Management Work Group (AMWG). These advisory panels have been a part of the Glen Canyon Dam adaptive management process since the inception of the GCDAMP. For more information on the adaptive management process, please see the GCDAMP Page.
Physical Resources
GCMRC has on-going monitoring and research focused on river sediment dynamics, long-term monitoring of sediment resources in the Colorado River corridor, and understanding the connectivity of sand resources throughout the system.
Biological Resources
Several GCMRC projects focus on understanding the biological processes of the Colorado River, the effect of dam operations on both native and nonnative species, population dynamics of important species, and the terrestrial-biological interactions.
Socio-Economic and Cultural
GCMRC is also concerned with understanding the socio-economic values of the Colorado River in Grand Canyon, the unique recreational opportunites this environment offers and the cultural significance observed by the Tribal people of this the region.
Administrative History and Guidance That Informs GCMRC Projects
The work plan for fiscal years 2018 to 2020 (FY18-20 TWP) is compromised of eleven active science projects that align with the needs of the GCDAMP stakeholders. Each project described in the FY2018–20 TWP is organized around monitoring and research themes that are associated with the eleven resource goals identified in the LTEMP ROD: archaeological and cultural resources, natural processes, humpback chub, hydropower and energy, other native fish, recreational experience, sediment, tribal resources, rainbow trout fishery, nonnative invasive species, and riparian vegetation (U.S. Department of the Interior, 2016a; Attachment A).
The monitoring and research projects are responsive to guidance provided in the LTEMP ROD, which, in addition to identifying the priority resources, also identifies flow and non-flow experimental actions and compliance obligations for Glen Canyon Dam operations for the 20 years of the LTEMP. Additional guidance comes from the Science Plan developed by GCMRC (VanderKooi and others, 2017) in support of the LTEMP ROD which describes a general strategy for monitoring and research needed in support of implementation of operations and experimental actions.
Projects in the current TWP have been informed by and build upon previous research and monitoring projects that were responsive to guidance vetted through the GCDAMP and the Secretary of Interior’s office. While the LTEMP ROD defines broad resource goals and identifies new experimental actions and compliance requirements, some of the older guidance continues to have relevance for certain aspects of the current science program and continues to influence current research and monitoring directions in a general sense. Among this older guidance, the following documents describe the history of GCDAMP decisions and direction and help maintain continuity with GCDAMP goals as LTEMP is implemented:
- 2001 Glen Canyon Dam Adaptive Management Program draft strategic plan (Glen Canyon Dam Adaptive Management Program, 2001),
- 2007 Strategic Science Plan and Strategic Science Questions (SSQs) (U. S. Geological Survey, 2007),
- 2011 draft Core Monitoring Plan (U. S. Geological Survey, 2011), and
- 2012 AMWG Desired Future Conditions.
Monitoring and research themes described in these and other GCDAMP administrative documents have persisted throughout the life of the GCDAMP and are carried forward into the LTEMP. They include:
(1) recovery of the endangered humpback chub (Gila cypha) and maintenance of populations of other native fish;
(2) maintenance or improvement of the physical template, especially regarding fine sediment;
(3) maintenance of culturally important sites, especially those that are of archaeological and historical significance under the National Historic Preservation Act
(4) maintenance of the food base on which the native fish community depends;
(5) maintenance of a high-quality sport fishery in the Lees Ferry reach; and
(6) maintenance of the native riparian vegetation community.
The various goals, questions, information needs, and desired future conditions developed by GCDAMP committees also recognize the importance of maintaining high quality opportunities and conditions for recreational boaters and campers, and the role played by nonnative riparian vegetation in providing habitat for some desired fauna such as the endangered Southwestern willow flycatcher.
- Science
Below are on-going science projects associated with GCMRC for the current 3-year work plan (FY2018 - 2020).
Filter Total Items: 15River Sediment Dynamics
Sediment controls the physical habitat of river ecosystems. Changes in the amount and areal distribution of different sediment types cause changes in river-channel form and river habitat. The amount and type of sediment suspended in the water column determines water clarity. Understanding sediment transport and the conditions under which sediment is deposited or eroded from the various...River Geomorphology and Geomorphic Change
River channels and their adjacent floodplains are ever evolving in form and composition in response to changing patterns of streamflow, the quantity and size of supplied sediment, and feedbacks with the riparian and aquatic ecosystems. Changes in channel form affect aquatic and riparian habitats, which are important for plants, animals, and insects. Erosion and deposition of river channels and...Sediment Storage in Grand Canyon
The sandbars exposed along the shoreline of the Colorado River represent only a small fraction of the sand deposits in Grand Canyon, most of which are on the bed of the river in eddies and the channel. Current management practice includes efforts to maintain and build sandbars by releasing high flows from Glen Canyon Dam that are timed to coincide with periods of fine-sediment supply from...River Campsites in Grand Canyon National Park
Sandbars have been used as campsites by river runners and hikers since the first expeditions to the region more than 100 years ago. Sandbar campsites continue to be an important part of the recreational experience for the more than 25,000 hikers and river runners that visit the Colorado River corridor each year. Because the Colorado River is dominated by bedrock cliffs and steep talus slopes...Geospatial Science and Technology
The U.S. Geological Survey’s Southwest Biological Science Center, and more specifically, its River Ecosystem Science branch which includes the Grand Canyon Monitoring and Research Center (GCMRC), is a preeminent science group that has more than 20 years of experience of providing high-quality, detailed science to resource managers and stakeholders primarily concerned with the effects of dam...Overview of Riparian Vegetation in Grand Canyon
Riparian areas are conspicuous belts of dense, green vegetation along streams and rivers, and can be considered “ribbons of life”. Despite covering less than 2 percent of the land area in the southwestern U.S., riparian areas tend to have high species diversity and population density, making them valuable to managers, scientists, and the public. These unique ecosystems act as a link between dry...Rainbow Trout Abundance and Movement in the Colorado River in Grand Canyon
Just below Glen Canyon Dam on the Colorado River is a very popular Blue Ribbon trout fishery known for its rainbow trout. However, approximately 78 miles downstream, near were the Little Colorado River flows into the Colorado River, is a population of endangered humpback chub. The introduced rainbow trout can negatively affect native humpback chub by competing with them for food (immature black...Uncovering the Base of the Food Web: Primary Production Dynamics in the Colorado River
Algae, phytoplankton, and rooted macrophytes represent the base of many aquatic food webs and are known as primary producers. Through photosynthesis, these organisms convert sunlight energy into chemical energy (i.e., carbon) that in turn fuels the growth of animals such as macroinvertebrates and fish. This project uses high frequency measurements of dissolved oxygen, which is a by-product of...Population Dynamics of Endangered Humpback Chub in Grand Canyon
The federally endangered humpback chub is a native fish of the Colorado River. Despite the environmental changes to the river following the construction of Glen Canyon Dam, humpback chub persists alongside nonnative species, including rainbow trout. The pre-dam Colorado River experienced seasonal variation in temperature and discharge. Seasonal flooding resulted in sediments carried downstream...Understanding Factors Influencing Rainbow Trout Growth in the Colorado River
Rainbow trout is a desirable sport fish that has been introduced in many locations around the world. Although introductions of rainbow trout and other nonnative fishes provide recreational fishing opportunities, they also pose threats to native fish populations. The Glen Canyon Dam Adaptive Management Program has tasked scientists and managers with identifying management options that allow rainbow...Connectivity of Sand Resources Along the Colorado River in Grand Canyon
We study the links among different geomorphic processes that affect river valley landscapes in the Colorado River downstream from Glen Canyon Dam, Arizona. Dam-released flows affect the deposition and retention of sandbars that serve as sources for other sand resources, such as windblown sand dunes, throughout the Colorado River ecosystem. The degree to which the landscapes are differentially...Riparian Remote Sensing in the Colorado River and Grand Canyon Region
Riparian vegetation has increased dramatically along the Colorado River downstream of Glen Canyon Dam since the closure of the dam in 1963. The spatial patterns and temporal rates of vegetation increase occur due to changes in river hydrology, dam operations, and climate. The increase in vegetation, particularly onto otherwise bare sandbars, has impacted recreational, geomorphological, biological... - Data
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