1952 Lake Okabena Bottom Study

Click on a # on the lake map to display that core boring in the left panel

The red numbers         1 to 7 designate 1952 borings for which the data could not be read. 
The blue numbers     8 to 14 designate 1952 borings for which there is valid data.
The black numbers 15 to 59 represent 1956 borings.

Point to a number here to display the boring in the LEFT PANEL

1952 Data Presented in Water Depth sequence

This may be some help seeing relationships between water depth and other bottom characteristics. There was no readable data for borings #1 through #7. The water level at the time of the 1952 study was 1576.09, which is just slightly running over the dam.

1952 Data Presented in SILT Depth sequence

This may be some help seeing the relationships between silt and depth or bottom characteristics. Notice the number of places (borings) where there was more silt depth than water depth. Those high silt places are denoted by the 1 pixel black border and light gray background. There are 2 of the 7 core borings where the silt is deeper than the water. #11 has 14.5 feet of silt in only 6.5 feet of water. That is abut twice as much silt as water at that particular location in the lake.

1952 Data Presented in SOLID BOTTOM sequence

Solid bottom is designated as where hard clay begins.  This solid bottom has probably been in the same place, undisturbed, since the last glacier, since it is only top soil, sand and gravel that move around.

The lowest solid bottom was at 1555.1 feet above sea level (#11), for a possible maximum water depth of 20.9 feet if there were no silt, sand, etc and the water was up to the runover level of the dam.

1952 Data Presented in boring # sequence

Bust 1952 lake bottom boring data out of frame to allow entire results to be printed

The 1952 and 1956 core borings of the bottom of West Lake Okabena were both documented on the same large lake map. This map and data came from files in the Soil Conservation District Office. The data was transferred to the attached spreadsheet for use here. The position of the numbers on this lake map correspond to the location of the core borings. The background view of the lake is a more recent satellite view of Worthington, not from the 1952-56 era.

Elevation above sea level is used to help make these studies comparable even though they were done when the water was at different levels.

The 1952 study ( boring numbers 1 to 14) was done when the water surface level was 1576.09 feet above sea level. The 1956 study (boring numbers 15 on)   was done when the water surface level was 1573.2. The dam runover level is 1576 feet above sea level.