Mugwump's Fish World
Other topics and Interests => Books, Magazines, Other On-Line Resources => Topic started by: BillT on December 08, 2015, 05:09:25 PM
Based on old maps from around Ishpeming, MI, near where my Dad grew up.
Beaver dams can last hundreds of years.
http://news.sciencemag.org/plants-animals/2015/12/150-year-old-map-reveals-beaver-dams-can-last-centuries?utm_campaign=email-news-latest&et_rid=33537079&et_cid=138606 (http://news.sciencemag.org/plants-animals/2015/12/150-year-old-map-reveals-beaver-dams-can-last-centuries?utm_campaign=email-news-latest&et_rid=33537079&et_cid=138606)
We have a few in the area here too. The wealthy Norris family in St Charles have such a dam on their property. In the 70's the spent over $25K to have the dam evaluated because it appeared to have a leak of good size. While the engineers were evaluating the project and drawing up a plan, over about 6 months time. The local and seldom seen beavers repaired the dam. ;D....work cancelled because the engineers declared that they could do no better.
There's a reason that engineering schools have beavers as their mascots.