Marker Color is determined by
CHLOROPHYLL CONCENTRATION

ALL of the lake has between 7 and 40 ug/L of chlorophyll and is considered "eutrophic."
The scale of this map has been adjusted to better show the range within the lake.

(Green = <10 ug/L, Yellow = 10-20 ug/L, Red = >20 ug/L)

YELLOW Site 1 (Bagnell Dam) Parameter Site Mean Unit Years of Data Secchi 66 inches 7 Total Phosphorus 24 ug/L Total Nitrogen 573 ug/L Chlorophyll 10.3 ug/L Inorganic Suspended Solids 0.7 mg/L YELLOW Site 3 (3 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 69 inches 1 Total Phosphorus 18 ug/L Total Nitrogen 458 ug/L Chlorophyll 12.7 ug/L Inorganic Suspended Solids 0.7 mg/L YELLOW Site 1-2 (2 Mile Marker of the Gravois Arm) Parameter Site Mean Unit Years of Data Secchi 60 inches 5 Total Phosphorus 25 ug/L Total Nitrogen 552 ug/L Chlorophyll 14.2 ug/L Inorganic Suspended Solids 1.2 mg/L YELLOW Site 13 (13 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 67 inches 12 Total Phosphorus 24 ug/L Total Nitrogen 526 ug/L Chlorophyll 12.8 ug/L Inorganic Suspended Solids 0.7 mg/L YELLOW Site 8 (8 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 72 inches 5 Total Phosphorus 26 ug/L Total Nitrogen 593 ug/L Chlorophyll 10.9 ug/L Inorganic Suspended Solids 1.2 mg/L RED Site 54 (54 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 26 inches 2 Total Phosphorus 73 ug/L Total Nitrogen 718 ug/L Chlorophyll 25.1 ug/L Inorganic Suspended Solids 5.8 mg/L YELLOW Site 26 (26 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 53 inches 8 Total Phosphorus 33 ug/L Total Nitrogen 619 ug/L Chlorophyll 14.2 ug/L Inorganic Suspended Solids 1.5 mg/L YELLOW Site 2-2 (2 Mile Marker of the Grand Glaize Arm) Parameter Site Mean Unit Years of Data Secchi 59 inches 3 Total Phosphorus 30 ug/L Total Nitrogen 565 ug/L Chlorophyll 10.9 ug/L Inorganic Suspended Solids 1.5 mg/L YELLOW Site 3-1 (1 Mile Marker of the Linn Creek Arm) Parameter Site Mean Unit Years of Data Secchi 50 inches 1 Total Phosphorus 30 ug/L Total Nitrogen 551 ug/L Chlorophyll 13.5 ug/L Inorganic Suspended Solids 2.2 mg/L YELLOW Site 4-3 (3 Mile Marker of the Niangua Arm) Parameter Site Mean Unit Years of Data Secchi 50 inches 7 Total Phosphorus 30 ug/L Total Nitrogen 537 ug/L Chlorophyll 19.1 ug/L Inorganic Suspended Solids 1.1 mg/L YELLOW Site 4-9 (9 Mile Marker of the Niangua Arm) Parameter Site Mean Unit Years of Data Secchi 46 inches 3 Total Phosphorus 35 ug/L Total Nitrogen 594 ug/L Chlorophyll 16.1 ug/L Inorganic Suspended Solids 2.2 mg/L YELLOW Site 45 (45 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 27 inches 4 Total Phosphorus 55 ug/L Total Nitrogen 783 ug/L Chlorophyll 12.3 ug/L Inorganic Suspended Solids 7.1 mg/L YELLOW Site 30 (30 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 53 inches 3 Total Phosphorus 36 ug/L Total Nitrogen 640 ug/L Chlorophyll 14.5 ug/L Inorganic Suspended Solids 2.1 mg/L RED Site 51 (45 Mile Marker) Parameter Site Mean Unit Years of Data Secchi 30 inches 3 Total Phosphorus 50 ug/L Total Nitrogen 608 ug/L Chlorophyll 20.6 ug/L Inorganic Suspended Solids 5.4 mg/L YELLOW Site C1 (Cove at Shawnee Bend) Parameter Site Mean Unit Years of Data Secchi 63 inches 5 Total Phosphorus 22 ug/L Total Nitrogen 503 ug/L Chlorophyll 14 ug/L Inorganic Suspended Solids 1.2 mg/L YELLOW Site 62 (Mile Marker 62) Parameter Site Mean Unit Years of Data Secchi 15 inches 1 Total Phosphorus 62 ug/L Total Nitrogen 732 ug/L Chlorophyll 16.3 ug/L Inorganic Suspended Solids NA mg/L YELLOW Site 61 (Mile Marker 61) Parameter Site Mean Unit Years of Data Secchi 16 inches 1 Total Phosphorus 64 ug/L Total Nitrogen 802 ug/L Chlorophyll 16.9 ug/L Inorganic Suspended Solids 20.1 mg/L YELLOW Site 53 (Mile Marker 53) Parameter Site Mean Unit Years of Data Secchi 22 inches 1 Total Phosphorus 67 ug/L Total Nitrogen 824 ug/L Chlorophyll 18.5 ug/L Inorganic Suspended Solids 11.1 mg/L RED Site 16 (Mile Marker 16) Parameter Site Mean Unit Years of Data Secchi 30 inches 1 (1998) Total Phosphorus 67 ug/L Total Nitrogen 828 ug/L Chlorophyll 28.3 ug/L Inorganic Suspended Solids 5.6 mg/L RED Site Villas (Niangua Arm - at "The Villas") Parameter Site Mean Unit Years of Data Secchi 50 inches 1 Total Phosphorus 37 ug/L Total Nitrogen 746 ug/L Chlorophyll 24.3 ug/L Inorganic Suspended Solids 1.1 mg/L RED Site 89 (Mile Marker 89) Parameter Site Mean Unit Years of Data Secchi 30 inches 1 Total Phosphorus 58 ug/L Total Nitrogen 905 ug/L Chlorophyll 20.8 ug/L Inorganic Suspended Solids NA mg/L

The chlorophyll concentration is an estimate of the amount of algae present. "Knowing the amount of algae in a lake is important because it is a way of monitoring the lake’s relative health. Algae are required for a healthy lake, as the algae are the base of the food chain and a source of dissolved oxygen. Just as a little algae are good, too much can be bad. Problems associated with excessive algae include: changes to the aquatic ecosystem that can affect the fishery, taste and odor problems, decreased recreational value, and loss of aesthetic value. Using filters to measure the chlorophyll concentration is a simple, relatively inexpensive and reliable way to gauge the amount of algae within the lake. With the help of volunteers, we are able to efficiently monitor this important component of lake ecosystem just by collecting a couple of little white filters." (excerpted from the Fall 2003 Water Line) Chlorophyll Concentrations in Missouri's Large Reservoirs Chlorophyll Concentrations in Missouri's Smaller Reservoirs (note: the scale of the graph has changed)