Click the link to read the article on the Summit Daily website (Ali Longwell). Here’s an excerpt:
February 6, 2024
Since 1974, the seven Colorado River basin states — Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming — have coordinated efforts to implement salinity control in the waterway as part of the Colorado River Basin Salinity Control Forum. The forum was created by the U.S. Congress, flowing funding through the Bureau of Reclamation to reduce the salt load in the river and research the issue…While salinity is naturally occurring, there are a few reasons that states and river stakeholders have long kept an eye on it.A baseline amount of salinity is OK. Too much salinity can have adverse effects on drinking water, water infrastructure and treatment, appliance wear, aquatic life, the productivity of certain agricultural crops (including wine grapes, peaches and other salt-sensitive products) and more. The U.S. Bureau of Reclamation estimates that salinity causes between $500 and $750 million annually in damages and could exceed $1.5 billion per year if future increases are not controlled…
Much of the Upper Basin geology — specifically Mancus and Mesa Verde shale formations — was created when it was covered by an inland sea, [David] Robbins added. Therefore, they contain salt deposits that through natural erosion and runoff, make their way to the rivers and downstream. In Colorado, natural salinity sources include the geothermal hot springs in Glenwood Springs; shale cliffs and evaporating salt deposits in the Eagle and Roaring Fork valleys; and the salt domes in Paradox Valley in Montrose County along the Dolores River. Human activity can also exacerbate challenges by accelerating the release of compounds from these natural geologic materials and increasing the salt load in the river and tributaries, according to the 2009 U.S. Geological Survey report. This includes activities like mining, farming, petroleum exploration and urban development. For example, with some agricultural irrigation practices, by adding more water to the soil that naturally contains salts, “increases the rate of dissolution above the natural signal,” [Dave] Kanzer said. The use of road salts — solid and liquid — to clear snow and ice can also lead to increased salt loads as the salt dissolves and makes its way into snowmelt and streams.
