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Storm and Surface Water

Introduction
	Drainage Basins
	Floodplain Map
	Flood Prevention
	Keeping Waterways Clean
	Peamouth Minnows
	Salmon in the City
	Storm and Surface Water System Plan
	New Zealand Mud Snails
	NPDES Program
	Streams, Lakes and Wetlands
	Stream Team
	West Nile Virus

New Zealand Mud Snails

Help stop the spread of invasive mud snails

New Zealand mud snails are attacking Kelsey and Valley creeks. These invasive snails may be tiny, but they reproduce at anything but a snail’s pace, spreading rapidly by cloning, and damaging habitat as they spread. The snails have little nutritional value and crowd out native invertebrates that fish and other aquatic life eat.

New Zealand mud snails have been found in only one other stream in the Lake Washington area, to date--Thornton Creek in Seattle. Able to live for weeks on damp gear, the snails can be easily transported by people, which is probably how they got to Bellevue.

There is no way to control these fast-growing snails once established. That’s the bad news. The good news is that residents can help prevent their spread.

The City of Bellevue has develped a mobile application for tracking New Zealand Mud Snails in Bellevue and surrounding areas. Check the map to find where the snails have been observed and their infestation levels.

Check out the types of infestation levels in Bellevue and snail identification information.

Visit Washington Dept. of Fish and Wildlife's website for more information on New Zealand Mud Snails and proper decontamination procedures.