What is it Wednesday: January 13, 2021

 

Can you identify what's in this photo?

 

 

Each Wednesday morning 

on Camp Lutherlyn's Facebook page

 the Lutherlyn Environmental Education Program posts a photo. 

 

 

Readers have all morning and afternoon 

to make their best guess about what the photo is. 

 

Around 6 pm LEEP provides the answer and a brief explanation.

 

 

Each week's What is it Wednesday post 

will also be posted on the Nature of Lutherlyn blog, 

 after it is posted on Facebook,

sometimes with additional bonus information. 

 

In addition to bringing you current editions of What is it Wednesday 

on the Nature of Lutherlyn blog, 

we will be reposting old editions,

creating a What is it Wednesday archive. 

 

This photo was posted as a What is it Wednesday on

January 13, 2021. 

 

 

 

And the answer is....

 

 

This is ice that had frozen on lower lake, which then collapsed 

and settled to the bed of the lake when the lake was drained for the winter.

Every winter, sometime after the Pastoral Plunge is complete, we drain the lower lake. (Both of Lutherlyn’s lakes are man-made, and include an outlet valve that can be closed or opened as needed.) Because we use lower lake for swimming and canoeing, it is helpful to control the amount of vegetation growing in it. Exposing the bed of the lake to freezing temperatures throughout the winter limits the amount of vegetation that builds up each year. Salamanders, turtles, frogs and tadpoles that live in the lake find enough soft mud in the lake bed to survive the winter. Any fish that are living in the lake either find refuge in a small amount of water that collects in the lowest spot below the jumping boards, are washed out into the stream with the draining water, or become food for herons, kingfishers, and raccoons.

This collapsed ice effect does sometimes occur naturally. If a natural dam - such as a beaver dam or a build-up of debris across a stream - has created a pond and then breaks during a cold spell, it can leave behind a scene similar to the one seen here. Flooding in winter can also freeze, leaving behind a layer of ice when the flood water recedes. If the ice layer is thick enough, and the flooding is among trees and other plants, the ice layer can even remain suspended above the ground as the water recedes, until it melts enough to weaken and break.

If you are only accustomed to seeing the lake in summer, it can be fascinating to see what it looks like when drained, with the contours of the lake bed now visible. You can visit Lutherlyn this winter to see this and other less-familiar winter sites – check out www.Lutherlyn.com for more info on Winter Family Getaways and other events! 

Like and follow Camp Lutherlyn on Facebook, to see What is it Wednesday posts when they come out and have the opportunity to share your guesses in the comments!