I’ve put together a Clary Lake Watershed Survey Base Map using Google Maps and watershed boundaries from the Maine Office of GIS for Clary Lake and Three Corner Pond. The map is basically a proof of concept effort, and a work in progress to boot as I’m still learning how to fit all the pieces together. The next step will be to put the 90 or so records of NPS (non-point-source) pollution sites from the original 2001 watershed survey into a database, geo-reference them with latitude and longitude, add pictures and updated information where necessary, and then finally, import them into the map. Continue reading →

Back in 2001 members of the Clary Lake Association with the assistance of some DEP staff conducted a watershed survey to identify and catalog sources of non-point source pollution. Typically these were areas where soil was eroding and running into the lake: road side ditches, road shoulders, driveways, unprotected shorelines, unstable slopes, clogged, poorly maintained, or improperly installed culverts, etc. Money for erosion control measures was available under the State’s Nonpoint Source Water Pollution Control Grants (“319”) program. 90 sites were identified and categorized as to whether they were Low, Medium, or High priority and a grant was obtained and erosion control measures were implemented at a number of the high priority site

The NPS pollution and “319” grant program is still in existence today. At this summer’s Congress of Lake Associations’ 43rd Annual Maine Lakes Conference held last Saturday the 22nd at Colby College which I attended, Norm Marcotte of DEP gave a short presentation on DEP’s new NPS Tracker Program which is basically like the old NPS program with added spreadsheet functionality and computer mapping features made possible by such programs as Google Earth and Google Maps.

Continue reading →

May started out dry but turned into a wet month indeed. On top of a dry April, we received no rain at all for the first 8 days of the month. The lake level started out -46.44″ below the top of the dam and fell at the average rate of 0.6″ per day to -56.52″ by the 17th of May at which point the dam’s gate was closed. Over the next 12 days we received 5.68″ of rain which brought the lake up 25.52″ for a runoff multiplier of 4.5x (4.5″ rise for each inch of rain) which is about what was expected. We ended the month at -31.08″ below the top of the dam. Average rainfall for May is 3.6″. The gate was reopened on the 27th and opened even further on the 30th. Runoff from the May rains has finally diminished to the point where the lake level has started falling again, having fallen just over 1″ as of this morning.

That was quite a stretch of wet weather eh? This afternoon as the sun started to break through I marveled at how long it has been since I’ve seen it, and how much rain we’ve gotten this month. April was a very dry month and May started out just as dry with no rain for the first 8 days. Since then we’ve received 5.5″ of rain which has so far brought the lake up 21.6″ with most of the rise occurring in the last 5 days. This afternoon the lake level sits at 34.9″ right at the bottom of the hole in the dam. As of this afternoon there was no water coming through the hole but as the lake continues to rise over the next few days that will change.

In any case, get out there and enjoy the (relatively) high water while it lasts. The lake hasn’t been this high since late June last summer and there’s no telling what to expect as the summer advances. The State boat launch is usable now and if you’re careful you won’t have any trouble getting your boat in the water. There’s 2.1′ of water over the foot of the ramp which is just a little shy of the design specification of 2.3′. Be mindful of the rocks- the water is only about 12″ deep 20′ off the end of the ramp.

I thought Kelley was going to open the gate this weekend in an attempt to keep the water level below the hole in the dam as he did last summer but he hasn’t touched it. Surprise, surprise. Last year he was ostensibly concerned about the impact of high water on the integrity of the dam and he did everything he could to keep the level -40″ or more below the top of the dam. Now maybe everything has changed; he has been referring to the dam as the “breached dam that formerly impounded Clary Lake” as if he’s given up on the useless, broken relic. Still, he’s trying to sell it and you’d think he’d want to keep it from deteriorating further especially considering he’ll probably still own it, and have to fix it, when the lake level order goes on.

Happy Memorial Day everyone.

It isn’t often that I update the water level charts more than once a day but I did this day, the water was coming up so fast you could almost watch it rise. The lake has come up a little more than 12″ since last Monday when it started raining, rising from -56.52″ below the top of the dam to -44.16″ earlier this afternoon and they’re forecasting rain for a couple more days too so the lake isn’t done rising by a long shot. Runoff was limited at the start because most of the rain soaked into the dry ground rather than running off into the lake the ground is now saturated and runoff rates are more or less normal now.

You’ll notice a new feature on the water level charts: a straight black line across the chart at an elevation of -34″ below the top of the dam which is the approximate elevation of the bottom of the hole in the dam. When the water rises above this level it will start pouring through the hole. Last year Kelley did everything he could to keep the lake level below -40″ to prevent enlargement of the hole, causing further damage to the dam. If he keeps up this practice this year, expect him to open the gate this weekend.

We’ve finally gotten around to putting current Clary Lake water monitoring data online. It’s a subset of the data collected by David Hodsdon and Jack Holland and will be updated roughly every 2 weeks from early spring through late fall or as often as David and Jack get around to it. What’s online now includes all the data from 2012 and what’s been collected so far in 2013. That little thumbnail at left is what a secchi disk looks like- it’s used to measure the transparency of the water.

• Clary Lake Water Monitoring Data

I hope to get some historical data online soon; there’s quite a bit of it. David has been collecting water quality data on Clary Lake since 1975, Jack Holland since about 2001. Both are certified volunteer water quality monitors. Here’s a typical data sheet from a data collection session and here are 3 charts based on the collected data. Graphing the data is helpful because it allows you to see trends in the data that aren’t necessarily obvious from just looking at it. One disturbing trend evident from the secchi disk chart is that the transparency of the lake water has deteriorated markedly in recent years. This trend also coincides with the increase in phosphorus evident from the Total Phosphorus chart. We’ll be talking more about these trends in the near future.

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Last spring I accompanied David and Jack on one of their regular water quality monitoring sessions and have put together a short photo gallery of that session: “Our Water Quality Monitors at Work“.

Some of you will remember seeing a table something like this last year, on the old site:

These figures were derived empirically which simply means these are based on measurements we made and recorded. They are what they are. They’re averages and on any given day they will likely vary a little or (even a lot) due to changing conditions: lake surface area, the shape of the lake, and most important, the amount of runoff from rain or snow melt. But all things being equal, these numbers should be pretty close most of the time.

Which brings me to the reason for this post: the question of how low can the lake get. I have in the past come to the conclusion that the rock-bottom low water level was somewhere around 6 feet (-72″) below the top of the dam. This figure was arrived at after measuring the water depth at the mouth of the channel at the northwest end of the lake. I also came across a fascinating book entitled “The Water Power of Maine” by Walter Wells, first published in 1869. In it I found a table that I’ve reproduced the table at left. It estimates the additional storage in Pleasant Pond (now Clary Lake) as 4 to 6 feet. Coincidence? I don’t think so.

Yesterday afternoon Colin Caissie and I went over to look a the narrow gauge rail road abutments to assess their suitability for the construction of a coffer dam. To get the distance between the abutments, I waded across the channel (and filled my boots in the process) while dragging a tape measure and found the center of the channel to be 2′ deep. The water level at the time was -54″ below the top of the dam. Adding 24″ to this gives you an elevation of the center of the channel between the abutments of -78″ or -6.5 feet below the top of the dam. The average distance between the abutments by the way is 16.5′. There are more pictures from this adventure in the Spring 2013 gallery.

And there you have it folks. The lake can’t possibly fall more than 6.5′ below the top of the dam and chances are, since there is a gentle slope to the channel on the order of about 1/2 a foot over it’s entire length, the limiting factor likely is the elevation at the entrance of the channel. So if anyone asks you how far the lake can fall, tell `em “6 feet.”

The lake is down -54″ now. It can fall another 18″. Last spring it reached -63″ below the top of the dam. At the rate the lake is dropping, we’ll get there again in 10 days.