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Dry spell deepens at Ralston Reservoir
October 20, 2026
Precipitation to date in September was 0.3 inches at Ralston Reservoir, 0.6 inches below the normal of 0.86 inches; August 2026 ranked as the 53rd driest August on record for Jefferson County since 1895. Continued precipitation shortfall in late summer and fall raises risk of delayed stream baseflow decline and vegetation stress typical of extreme drought.
Extreme drought grips Jefferson County in September
October 20, 2026
Extreme drought (D3) covered 44.41 percent of Jefferson County in the week of September 15-21, 2026. Concentrated water stress limits dilution of pollutants and elevates temperature in streams, pressuring aquatic species that require clean, cool water as the drought persists into fall.
Exceptional drought spreads across Jefferson County
October 20, 2026
Jefferson County carries 2.03% of its area in exceptional drought (D4) as of the week ending October 19, 2026, with severe drought affecting 44.40% of the county. Exceptional drought conditions developed in mid-September after a largely dry water year, raising fire risk and water stress heading into late fall.
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