MISSOULA — The remnants of Glacial Lake Missoula sit 30 feet below the valley floor and rest several hundred feet deep. Even now, that hidden lake remains Missoula's only source of clean drinking water.

Given the aquifer's importance, the City of Missoula hired Morrison-Maierle in 2023 to develop a new stormwater quality plan — itself an update on a plan created in 2018.

The new plan looks to implement actions to protect both surface and groundwater quality, and it comes with a broad range of recommendations.

“It's our job to manage the quantity, quality and the routing of stormwater runoff,” said Tracy Campbell, the city's stormwater superintendent. “We know the community values our clean water resources, and we're committed to protecting them.”

The plan covers the city's drainage cha

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