Thornton Reservoir at 73% Capacity Amid Drainage Efforts
Thornton Reservoir at 73% Capacity Amid Drainage Efforts
US · Published Jul 15, 2026
The Thornton Composite Reservoir in Illinois has reduced its water level to 73% capacity after nearly reaching its highest recorded level of 94% during heavy rainfall on July 4 and 5,
The Metropolitan Water Reclamation District of Greater Chicago is actively draining the reservoir and addressing odor concerns. The reservoir, operational since 2015, serves as a critical flood mitigation system by capturing stormwater and protecting water quality. Odor complaints have been mixed, with some residents reporting a strong stench while others claim it is dependent on wind direction and water levels. Efforts to mitigate odors include the installation of a carbon filter system and an odor-neutralizing mist, both expected to be completed by mid-

Impact & Risks

The reservoir's drainage and odor mitigation efforts are crucial for surrounding communities, as the system reduces flooding and protects water quality. However, odor concerns have been reported, with some residents describing the smell as 'putrid.' While the Metropolitan Water Reclamation District is closely monitoring conditions and conducting odor patrols, the issue remains a challenge during certain operational phases. Additionally, severe storms and tornadoes in Illinois on June 11 have prompted federal disaster loans for affected residents and businesses, highlighting the broader impact of extreme weather events in the region.

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