East Pond Data 2008

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 2008 East Pond Secchi

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 The following graph shows the East Pond secchi depths taken in two locations. The Secchi depths track at both stations indicating that the lake is well mixed horizontally. The green line at two meters represents the standard secchi depth for algal blooms.  The data used in the graph can be seen in the following:  Secchi depths vs. time.xls

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5/3/2008: 

King launched the Colby pontoon boat.  Sampled for nutrients 69.76657 W, 44.5964 N in stream outflow near boat launch, and took a lake profile at Colby A (DEP1). 

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Colby sampled East Pond and found moorings for temperature sensors.

Activity

Location

Notes

Profile

Colby

EP ColbyA0606b.xls

 







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 On 6/6/2008 East Pond and North Ponds are  mixed at 17 oC.      The Secchi depth in East Pond is shallower again with a depth of 2.5 meters.   The lake is experiencing a moderate bloom as illustrated by the uniform fluorescence profile.  Oxygen concentrations remain at saturation throughout the water column.






















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6/10/2008

EDITProfiles at north and south stations.

Activity

Location

Notes

Profile

Colby A

Secchi 3.95,  EP061008DEP1a.xls

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 EDIT

This is text

 

Colby B

Secchi 4.2, EP061008DEP2b.xls




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East Pond is well mixed with a moderate bloom at both stations.

 Colby A

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Colby B
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6/17/2008

Colby took profiles at north and south station, and found the mooring at south station.

Activity

Location

Notes

Profile

Colby A

Secchi 5.25m  EP061708DEP1b.xls

 

Colby B

Secchi 5.19m EP061708DEP2a.xls




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Secchi depth continues to increase.  The lake is very well mixed and saturated with oxygen. Watch the units on the graphs when comparing dates.

 Colby A

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Colby B 
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6/24/2008

Colby took profiles at north and south station.

Activity

Location

Notes

Profile

Colby A

Secchi 6.80m  EPcolby6242008sitea.xls

 

Colby B

Secchi 6.70m  EPcolby6242008siteb.xls




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The secchi depth has increased all the way to the bottom of the lake at both stations.  Oxygen is starting to drop.  Notice the surface warming in the top 0.5 meters.

 Colby A

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Colby B
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7/1/2008

Colby took profiles at north and south station, and took images of the benthos of the lake heading east from Colby A.

Activity

Location

Notes

Profile

Colby A

Secchi 6.68m  EP070108DEP1a.xls

 

Colby B

Secchi 6.70m  EP070108DEP2b.xls




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The Secchi depth remained at or near the bottom at both stations.  The lake is becoming stratified at 4.5 meters.  The "colder" deep water prevents mixing of surface water with the deep lake water resulting in reduced oxygen input from the surface.   Sediment oxygen demand is consuming oxygen in the deep water as shown by the significant decrease in oxygen at both stations below 4.5 meters.

 Colby A

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Colby B
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7/8/2008

Colby took profiles at north and south station, and took images of the benthos of the lake heading east from Colby A.

Activity

Location

Notes

Profile

Colby A

Secchi 5.70m  EPcolby070808DEP1a.xls

 

Colby B

Secchi 5.87m  EPcolby070808DEP2a.xls




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The Secchi depth decreased nearly a meter at both stations.  The lake is now becoming stratified at 5.5 meters.

 Colby A

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Colby B
 
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7/15/2008

Colby took profiles at north and south station.

Activity

Location

Notes

Profile

Colby A

Secchi 5.49m  EPcolby071508DEP1b.xls

 

Colby B

Secchi 5.45m  EPcolby071508DEP2a.xls




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 Colby A
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 Colby B
 
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