DNR pleased by work on northern Iowa marsh

VENTURA, Iowa (AP) — After $5 million in work that stretched over five years, a marsh bordering Clear Lake is filling up with aquatic vegetation and has begun filtering water more effectively.

The Mason City Globe Gazette reports (http://bit.ly/17g0H8N ) that the Department of Natural Resources has drawn down water in Ventura Marsh for a second year and is seeing plants like cattails sprout.

When a marsh works properly, it acts as a filter, so water flows out cleaner than it flowed in.

Work began to improve Ventura Marsh after state and local officials grew concerned about increased phosphorus levels in Clear Lake.

Besides planting aquatic plants, work included demolishing an outlet structure, building a new emergency spillway and pump station and dredging a channel.

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Information from: Globe Gazette, http://www.globegazette.com/

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