Eskilstunaån

Eskilstunaån is a river in Södermanland, Sweden. It originates in the lake Klämmingen and flows through the city of Eskilstuna before emptying into Lake Mälaren. The river has played a significant role in the industrial development of Eskilstuna, historically powering watermills and later serving as a route for transportation and energy generation.

The total length of Eskilstunaån is approximately 22 kilometers. Along its course, it passes through several lakes, including Freden and Näcksta, before reaching the larger Lake Mälaren. The river's flow is regulated by several weirs and dams, primarily for hydroelectric power generation and flood control. The presence of these structures has altered the natural course and ecosystem of the river over time.

The water quality of Eskilstunaån has been a subject of concern and improvement efforts. Historically, industrial pollution significantly impacted the river's health. In recent decades, environmental regulations and rehabilitation projects have led to a noticeable improvement in water quality, allowing for a greater diversity of aquatic life to return. The river is now used for recreational activities such as fishing and boating.