Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 28-01-2013, 05:41   #16
Registered User
Kalinka1's Avatar

Join Date: Nov 2010
Location: Toronto
Boat: Heritage 35
Posts: 250
Re: Lake levels

Lake Ontario is mostly governed by the dam at Iroquoix
Originally Posted by Mike OReilly View Post
There is an excellent resource at the Great Lakes Environmental Research Laboratory where you look at actual data over time. A cursory examination of the trends suggests (to me) that the upper lakes (Superior, Huron & Michigan) are into a significant declining period which may be unprecedented. Since the late 1990s these lakes have been well below the long-term average. There was a similar low-level period in the late 1950s to early 1960s, but the current levels appear more stable at their low level rates.

For Erie and Ontario, what strikes me is how stable the depths have been since the late 1990s. There's more variability with Erie vs Ontario, but both appear to be hovering right around the long-term average depth. Makes me wonder if the lower lakes' water levels are being more actively managed.

So the reality indicates that the lower lakes are pretty stable around the long-term average depths, while the upper lakes are into a decline which may become unprecedented. As someone has already said, the major reasons for the lower water levels in the upper lakes appears to be decreased inflow from rain and snow, but more importantly, the increased evaporation rates due to decreased ice coverage.

According to a recent NOAA paper, "Total annual average ice cover on the Great Lakes has shown an overall decline of 71%, while the annual maximum ice cover shows an overall decline of 52% over the period 1973-2010 (38 years)." According to another recent paper published in the Journal of Great Lakes Research looking at Lake Superior's ice rates, "Analysis of the data indicates that the duration of ice cover on Lake Superior at Bayfield, Wisconsin has decreased over the past 150 years at the rate of approximately 3 days/decade or 45 days over the course of the study."

With regard to the St. Claire River dredging, the research I've read suggests that while there is some contribution to lowering Huron, Michigan and Superior, it remains a small effect compared to evaporation and diminished water inputs (rain and snow).

Kalinka1 is offline   Reply With Quote
Old 18-03-2013, 07:01   #17
Registered User

Join Date: Sep 2011
Location: USA
Boat: 1982 Baba 35 / 1977 Columbia Payne 9.6
Posts: 24
Re: Lake levels

It's not surprising to me that the lower lake levels have been more stable.. gravity works!

CaptainKevinM is offline   Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:48.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.