Lake formed by dam in river
29 November, 2021
Hello, the page discussing immersion in rivers answers most, but not all of my questions. On the page, it reads, “a natural lake that is fed by river water and springs may be used for the immersion.” The remaining question is: If a lake is formed on a river by way of building a dam in the river, is this newly formed collection of water still considered kosher for the mikveh? The river water still flows over the dam and downstream into the original river channel. There are easy beach-style entries into this body of water for easy privacy concerns.
Since the river flows through the lake and over the dam, the lake that you describe should be considered a kosher mikveh, as long as the river is mostly fed by springs or other rivers (and not rainwater).
However, it’s not always easy to determine the source of the water, especially in winter and early summer, so if you are unsure it would be wise to investigate further.
Please let us know if we can be of further assistance.
This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases. All health and health-related information contained within Nishmat's Women's Health & Halacha Web site is intended to be general in nature and should not be used as a substitute for consulting with your health care professional. The advice is intended to offer a basis for individuals to discuss their medical condition with their health care provider but not individual advice. Although every effort is made to ensure that the material within Nishmat's Women's Health & Halacha Web site is accurate and timely, it is provided for the convenience of the Web site user but should not be considered official. Advice for actual medical practice should be obtained from a licensed health care professional.
For further questions or comments:
The Nishmat Women's Health and Halacha Site is a public service of Nishmat, The Jeanie Schottenstein Center for Advanced Torah Study for Women. This project and others like it are made possible by contributions from people like you. If you have benefited from the service, and wish to enable us to help others, click here to donate.
Users of Internet filtering services: This site discusses sensitive subjects that some services filter without visual indication. A page that appears 100% complete might actually be missing critical Jewish-law or medical information. To ensure that you view the pages accurately, ask the filtering service to whitelist all pages under yoatzot.org.