Follow Up from the last Nutrient Criteria Meeting Dan Obrecht – UMC Limnology

Bootheel Region The region is also referred to as the Mississippi Alluvial Plains Region. Five Missouri counties are entirely within the region with another six counties being partially in the region. Elevation in the region ranges between 240 to 335 feet above sea level, with the exception of isolated ridges that rise above the alluvial plain.

How many Classified Lakes/Reservoirs? Dunklin – 0 New Madrid – 0 Mississippi – 5 Pemiscot – 2 Stoddard – 9 Based on 2005 list

MU Data Secchi (meters) TP (μg/L) TN (μg/L) CHL (μg/L) ISS (mg/L) Delaney Big Oak Both lakes sampled in 2001 and 2002

Delaney Lake Mississippi Co. 110 acres

Big Oak Mississippi Co. 22 acres

Other Mississippi Alluvial Plains Waterbodies

Dexter City Lake Stoddard County 11 acres

Combs Lake Pemiscot Co. Not Classified 150 acres

Hall’s Lake – Crowley’s Ridge CA Stoddard County 50 acres Not Classified

How do we deal with lakes and reservoirs in the Mississippi Alluvial Plains?

Sample Size?

How many Samples to Take? ParameterPrecisionSummerSpring-Fall Total Nitrogen 15%34 25%12 Total Phosphorus 15%37 25%12 Chlorophyll15% %46

Large Reservoir - Spatial Variability

Table Rock Lake 2005 average TP

Bull Shoals Lake – Little North Fork Arm average TP 7

Long Branch Lake average TP

Stockton Lake 2004 average TP 29 53

James River Arm - March 1, 2001

James River Arm – August 3, 2000