Along the Columbia River, milfoil, an invasive aquatic weed, can make boating and recreation difficult. Park maintenance crews use a milfoil harvester, which cuts and collects the plants, keeping waterways clear and safe for visitors.

Once harvested, the milfoil is taken to compost piles, where it naturally breaks down, providing an eco-friendly solution for managing invasive plants. This method helps maintain the river environment while ensuring parks remain accessible and enjoyable.

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