LWR Floodplain Lakes 303d evaluation - SCR_11_CMP15

Purpose

Jean Unmuth and two interns will monitor two floodplain lakes greater than 5 acres in size for 303(d) evaluation from 01/01/2014 through 09/15/2015, with a final report completed by March 2015. Projected total project cost over the two year period is $8,415.00. Monitoring using WisCALM 2014 lakes methodology will begin in June, and be completed by Sept. Monitoring includes three water chemistry samples collected with an integrated sampler to include TP, TKN, nitrate-nitrites, total nitrogen, pH, alkalinity, conductivity collected monthly from June 1 - Sept. 15 over a two year period, and three samples for Chl a proposed to be collected from July 15-Sept 15 during the second year of the project. Two additional water chemistry samples/year in each lake will be collected during flood events to determine changes in floodplain lake water chemistry when alluvial groundwater likely dominates lake source water versus baseflow periods when upland groundwater dominates lake source water. Water quality profiles will be collected during all chemistry collections using a YSI pro plus meter.

Objective

This project will address whether the floodplain lakes should be proposed for listing on the 303(d) impaired waters list for TP, Chl a and dissolved oxygen. Recent studies sponsored through River Alliance and Sauk County Lakes and Rivers planning grants, indicated that phosphorus concentrations have increased above the recommended criterion for surface water standards in non-stratified drainage lakes of 40 ug/l. These sloughs also have periodic high nitrate concentrations, and low dissolved oxygen concentrations, and have had excessive metaphyton cover that appears to have increased, while submergent plants have decreased between 2008 and 2013. Both lakes are in the drainage of agricultural lands. Lakes proposed for monitoring are Norton Slough (WBIC: 1247100, SWIMS station: 10021273), and Jones Slough (WBIC: 1247300, SWIMS station: 10021272),

Outcome

Data will be analyzed to determine if it meets or exceeds TP Chl a, and DO, and if not an impaired waters document will be submitted for inclusion on the next impaired waters list. Water chemistry and nitrate data will be analyzed and a final summary report written. Some comparisons can be made between historic surface water resources reports, and nitrate information may be useful in adding to a dataset useful to determining state nitrogen standards in the states shallow drainage lakes.

Study Design

June 1 - Sept. 15, 2014-2015 for 3 TP and assoc. water chemistry and lake profiles at the deep holes of each lake. July 1 - Sept. 15, 2015 for 3 chl a samples at the deep hole of each lake. Water quality sondes for one week during June, July, or August to collect temp, DO, pH, Conductivity at deep hole of each lake.

Related Reports

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Competitive Projects
Impaired Water Assessment
SCR_11_CMP15
2014
Active
 
Reports and Documents
Plant point intercept survey completed June 2015
Point intercept survey completed June 2015.
TP calculations for determining impairments
Plant PI file with raw data and summary statistics
Jones Slough point intercept raw data and summary statistics
Tables of water chemistry collected 2015 and prior for Jones and Norton Sloughs
Norton Slough TP calculations for determining lake impairment
Aquatic vegetation point intercept survey including invasive plants. Survey conducted June 2015
Point Intercept Survey data collected June 2015
 
Activities & Recommendations
Monitor or Propose 303(d) Listing
Monitor or Propose 303(d) Listing
Aquatic Plant Monitoring or Survey