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Connects historical and paleontological records of western Colorado's aquatic and terrestrial fauna with regional water management, natural area designation, and community-based environmental planning across the San Luis Valley and Grand Valley.
Land and water management in the Colorado Basin and adjacent valleys of western Colorado sits at the intersection of wildlife conservation, agricultural heritage, water rights, and energy infrastructure. The Gunnison Basin and neighboring regions like the San Luis Valley face overlapping pressures: declining aquifers, habitat loss for species such as sage grouse and Gunnison sage-grouse, conversion of agricultural land, and competing claims on surface and groundwater. Understanding how these pressures interact requires attention to paleoecology (the study of ancient ecosystems preserved in rock and fossils), biogeochemical tools like strontium isotope tracing (the use of 87Sr/86Sr ratios to track water and nutrient sources), and emerging concerns such as dissolved arsenic (dissolved As) in groundwater.
The management policies covered here also include community planning mechanisms like UDAG funds (Urban Development Action Grants used historically for community infrastructure), sage grouse habitat enhancement programs, and large federal water projects such as the Closed Basin Division of the San Luis Valley Project, which pumps shallow groundwater to help Colorado meet its Rio Grande Compact obligations. For ranching communities, small towns, and federal land managers across western Colorado, these issues determine whether working landscapes, native wildlife, and rural economies can coexist.
Colorado's natural area protections evolved through a combination of state designation programs and federal land management. The Appendix 2 list of Designated and Registered Colorado Natural Areas Appendix 2, Colorado Natural Areas documents sites managed cooperatively by the State Land Board (SLB), The Nature Conservancy (TNC), and the Bureau of Land Management (BLM) to protect biodiversity, habitat, and paleontological resources. Agricultural land protection emerged as a parallel concern, with the Governor's Task Force on Agricultural Lands documenting decades of farmland conversion along the Front Range and Eastern Colorado Agricultural Land Conversion in Colorado.
Water law and federal water rights have shaped the region for over a century. In the San Luis Valley, the 25 Facts About Water in the San Luis Valley report compiles precipitation, groundwater, and irrigation data going back to 1887 25 Facts About Water in the San Luis Valley. Negotiations over federal reserved water rights on the Rio Grande National Forest, involving the U.S. Forest Service and the Rio Grande Water Conservation District, have continued since 1984 . Salinity in Colorado River return flows became a federal priority in the 1970s, with early research in the Grand Valley quantifying salt pickup from irrigated lands and later developing best management practices for salinity control .
Environmental assessment. Covers Aiken Canyon, Badger Wash Natural Area, Blue Mountain-Little Thompson Fault Natural Area. Topics: natural area design...
Technical report (FY 1996). Covers Region 8, Utah, Missouri River Basin. Topics: Community-Based Environmental Protection, Ecosystem Protection, publi...
Technical report (April 1997). Covers Colorado, Utah, Western United States. Topics: stratigraphic architecture, hydrocarbon systems, facies distribut...
Environmental assessment (January 2018). Covers Monarch Pass, Fort Carson Military Reservation, Gunnison Basin. Topics: Section 368 Energy Corridor, e...
The Real Threat To Wildlife By \tow Tae Colorado wildlife have faced many threats over the last century and a half, not always successfully Wolves and...
News article. Covers Rio Grande, Valley, Gulf of Mexico. Topics: riparian corridors, water quality monitoring, greenway trail. Agencies: Citizens for ...
Key agencies include the BLM, U.S. Forest Service (USFS), Western Area Power Administration, and the Environmental Protection Agency (EPA), alongside state bodies like the Colorado Department of Agriculture. Energy infrastructure planning is illustrated by the Section 368 Energy Corridor regional reviews covering Monarch Pass, Fort Carson, and the Gunnison Basin, which coordinate electrical transmission and pipeline siting across federal lands Section 368 Energy Corridor Regional Reviews. The EPA's Community-Based Environmental Protection program, run through the Office of Sustainable Ecosystems and Communities, exemplifies the shift toward participatory ecosystem management involving tribes such as the Yankton Sioux (Community-Based Environmental Protection FY 1996).
Non-governmental stakeholders are equally important. The Rio Grande Water Conservation District, Citizens for San Luis Valley Water, and the Rio Grande/Rio Bravo Coalition coordinate riparian protection, water quality monitoring, and opposition to water export schemes The Rio Grande. Faith communities have engaged with water stewardship and recycling debates SLV Pastors Discuss Water Issues and Stewardship, while ranching narratives like The Last Ranch document holistic resource management as a working alternative to land subdivision and water exportation The Last Ranch. Wildlife management agencies confront habitat fragmentation affecting species ranging from river otter (Lontra canadensis) to Mexican spotted owl, Lesser Prairie Chicken, sharp-tailed grouse, and Skiff milkvetch Colorado's Wildlife Company: Habitat Crisis.
Groundwater depletion is the most acute emerging crisis. Reporting from the San Luis Valley documents wells dropping to critical levels during drought, with shallow aquifers in La Jara and Capulin no longer supporting standard pumps Well water dropping to critical levels. Engineers have warned that the unconfined aquifer beneath the Closed Basin is being drawn down faster than recharge can replace it Engineer sounds valley aquifer alarm. Proposed water exports to Front Range cities, energy corridor expansion, and the housing pressures documented in late-night planning discussions Late Night Planning Reader – Housing all compound the strain on rural water budgets.
Looking forward, managers must integrate paleoenvironmental baselines, modern biogeochemistry, and adaptive habitat policy. Deep-time studies of regional stratigraphy and depositional environments, such as field excursions documenting Colorado and Utah hydrocarbon systems Field Excursion to Colorado and Utah and the Middle Jurassic Todilto Formation (Kirkland et al., 1995), provide context for understanding aquifer geometry and salinity sources. Late Devonian fish faunas from the western United States (Denison et al., 1951) remind us that the basin's water bodies have a long evolutionary history shaping today's biodiversity.
Research at RMBL and across the Gunnison Basin links directly to these management questions. Studies of montane hydrology, snowpack, and stream chemistry inform downstream water budgets that the Rio Grande Water Conservation District and Colorado River salinity programs depend upon. Long-term phenology and population monitoring of sensitive species parallel state and federal habitat enhancement efforts for sage grouse and other declining wildlife. Strontium isotope tracing and trace-element geochemistry developed in paleoenvironmental studies are now applied to modern questions about dissolved arsenic, nutrient sourcing, and aquifer recharge — bridging the deep-time and contemporary policy concerns that define this knowledge neighborhood.
25 Facts About Water in the San Luis Valley. →
Agricultural Land Conversion in Colorado A Preliminary Report. →
Appendix 2, Colorado Natural Areas. →
Colorado's Wildlife Company: Habitat Crisis. →
Community-Based Environmental Protection FY 1996 Progress Report. →
Denison et al., 1951 — Late Devonian fresh-water fishes from the western United States. →
Engineer sounds valley aquifer alarm. →
Field Excursion to Colorado and Utah, Western United States. →
Kirkland, Denison & Evans, 1995 — Middle Jurassic Todilto Formation. →
Late Night Planning Reader – Housing. →
Negotiations Continue on Federal Water Rights. →
Section 368 Energy Corridor Regional Reviews – Region 2. →
Skogerboe & Walker, 1973 — Salt Pickup from Agricultural Lands in the Grand Valley of Colorado. →
SLV Pastors Discuss Water Issues and Stewardship. →
The Last Ranch: A Colorado Community and the Coming Desert. →
The Rio Grande. →
Walker et al., 1979 — Developing best management practices for salinity control in Grand Valley, Colorado. →
Well water dropping to critical levels. →
Technical report (1959-1992). Covers Colorado, Front Range, Eastern Colorado. Topics: agricultural land conversion, farmland protection. Agencies: Col...
News article (1975-1998). Covers San Luis Valley, Closed Basin, Great Sand Dunes. Topics: aquifer, water management, aquifer recharge. Agencies: Rio G...
News article (1984-ongoing). Covers Rio Grande National Forest, San Luis Valley, Middle Creek. Topics: instream flow claims, federal water rights. Age...
Document. Covers Colorado, San Luis Valley, Saguache County. Topics: Holistic Resource Management, land management practices, water exportation, ranch...
News article. Covers San Luis Valley, Eastern slope of the Rockies, Mosca. Topics: water stewardship, water recycling, water transfer, aquifer managem...