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Monsoon Rains Arrive, But Can't Save Colorado River
17 Sep
Summary
- Monsoon rainfall is expected this week but offers little help to the depleted Colorado River.
- Localized drought relief is possible, but not the prolonged rain needed for reservoirs.
- The Southwest faces a multi-decadal drought impacting the Colorado River Basin.
Monsoon rainfall is anticipated across the drought-stricken Southwest this week, bringing a risk of flash flooding but limited relief for the severely depleted Colorado River system. While some areas may see localized, short-term drought improvement, meteorologists state that prolonged rain and mountain snow are necessary to substantially impact major reservoirs. This seasonal monsoon, historically influenced by El Niño, is bringing moderate rainfall to parts of New Mexico, Arizona, and Colorado.
The Colorado River Basin, covering 250,000 square miles across seven U.S. states and Mexico, supports approximately 40 million people and 5.5 million acres of farmland. Hydropower facilities also rely on its flow. Despite the expected rainfall, it is unlikely to counteract years of drought and water shortages that have pushed lakes Mead and Powell to record lows since the mid-1990s.
Long-term drought relief for the region requires multiple years of favorable conditions, including wet monsoon seasons and substantial winter snowpack, which feeds into the Colorado River. As current operating rules for the Colorado River expire at the end of 2026, negotiations continue among basin states regarding the management of shrinking water supplies and reservoir operations.
