Annual Report 2011 Annual Report
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Houghton Lake Annual Report 2011 Annual Report Prepared for: Houghton Lake Improvement Board P.O. Box 843 Houghton Lake, MI 48629 Prepared by: Progressive AE 1811 4 Mile Road, NE Grand Rapids, MI 49525-2442 616/361-2664 September 2011 Project No: 55520101 Houghton Lake 2011 Annual Report Prepared for: Houghton Lake Improvement Board P.O. Box 843 Houghton Lake, MI 48629 Prepared by: Progressive AE 1811 4 Mile Road, NE Grand Rapids, MI 49525-2442 616/361-2664 September 2011 Project No: 55520101 Table of Contents INTRODUCTION . 1 AQUATIC PLANTS. 3 Survey Methods and Results . 3 Plant Control in Houghton Lake, 2002 - 2011. 6 LAKE WATER QUALITY . 8 Temperature . 8 Dissolved Oxygen . 9 Phosphorus . 9 Chlorophyll-a .................................................................10 Secchi Transparency. 10 Sampling Methods. 10 Sampling Results and Discussion. 12 INFORMATION AND EDUCATION . 16 WATERSHED MANAGEMENT . 17 FISHERIES MANAGEMENT . 19 APPENDICES Appendix A – Starry Stonewort Appendix B – Houghton Lake Historical Water Quality Data Appendix C – Houghton Lake Improvement Board Website Postings Appendix D – Low Impact Development Seminar Invitation and Presentation REFERENCES Houghton Lake 55520101 2011 Annual Report iii TABLE OF CONTENTS LIST OF TABLES Table 1. Houghton Lake Aquatic Plants, 2011 . 5 Table 2. Houghton Lake Plant Control History. 6 Table 3. Lake Classification Criteria. 10 Table 4. Houghton Lake 2011 Depth Profile Water Quality Data. 12 Table 5. Houghton Lake 2011 Surface Water Quality Data . 13 Table 6. Houghton Lake In-Lake Summary Statistics, 2003-2011 . 13 Table B1. Houghton Lake 2003 - 2010 Depth Profile Water Quality Data. B-1 to B-9 Table B2. Houghton Lake 2003 - 2010 Surface Water Quality Data . B-10 to B-13 Table B3. Houghton Lake 2003 - 2008 Tributary Monitoring Data. B-14 to B-16 LIST OF FIGURES Figure 1. Houghton Lake Depth Contour Map. 1 Figure 2. Eurasian Milfoil . 2 Figure 3. Aquatic Plant Survey Sampling Locations, June 8-10, 2011 . 3 Figure 4. Aquatic Plant Survey Sampling Locations, August 10-11, 2011 . 4 Figure 5. Eurasian Milfoil Treatment Areas in Houghton Lake in 2011 . 7 Figure 6. Lake Classification . 8 Figure 7. Lake Stratification and Turnover . 9 Figure 8. Secchi Disk . 10 Figure 9. Houghton Lake Sampling Location Map. 11 Figure 10. Houghton Lake Median Total Phosphorus Concentrations, 2003 - 2011 . 15 Figure 11. Houghton Lake Average Chlorophyll-a Concentrations, 2003 - 2011. 15 Figure 12. Houghton Lake Average Secchi Transparency Measurements, 2003 - 2011 . 15 Figure 13. Houghton Lake Improvement Board Web Site . 16 Figure 14. Houghton Lake Watershed Map . 17 Figure 15. Fishing on Houghton Lake . 19 Houghton Lake 55520101 2011 Annual Report iv Introduction Houghton Lake is Michigan's largest inland lake at 20,044 acres, but it is also shallow with an average depth of less than 10 feet (Figure 1). Aquatic plants have been abundant and diverse in Houghton Lake for many years. By the late 1990's, the nuisance exotic plant, Eurasian milfoil (Myriophyllum spicatum, Figure 2), had spread to approximately 11,000 acres of the lake and was crowding out beneficial native plant species. The Houghton Lake Improvement Board was formed in 2000 under the provisions of Part 309 of Act 451 of 1994 (the Natural Resources and Environmental Protection Act). The lake board commissioned a management feasibility study of Houghton Lake that was completed in January of 2002 (Smith et al. 2002). To address the widespread milfoil problem, a whole-lake treatment with the aquatic herbicide fluridone (trade name Sonar®) was conducted in the spring of 2002 as part of a five-year management plan. In 2006, public hearings were conducted pursuant to statute and the management plan was continued for an additional five years (2007 to 2011). Key components of the management plan include aquatic plant control, water quality and vegetation monitoring, information and education, watershed management, and fisheries management. This report contains a status of the project through 2011. Figure 1. Houghton Lake depth contour map. Houghton Lake 55520101 2011 Annual Report 1 INTRODUCTION Figure 2. Eurasian milfoil. Houghton Lake 55520101 2011 Annual Report 2 Aquatic Plants SURVEY METHODS AND RESULTS In 2011, aquatic plant surveys of Houghton Lake were conducted from June 14 through 16 and on August 10 and 11 using the point-intercept method (Madsen 1999). Sampling locations were established at grid- points with a global positioning system (GPS). At each sampling location, a double-sided thatch rake attached to a line was dragged for approximately 15 feet in two rake tosses, one on each side of the boat. The June survey was used to identify the location of Eurasian milfoil beds in the lake by sampling 2,808 points spaced at 500-foot intervals in water depths less than 12 feet (Figure 3). Historical vegetation surveys indicate plants do not grow in depths greater than approximately 12 feet in Houghton Lake. Mead Rd Kens Pl N Shore Dr ´ !! !!!!!!!!! Lakewood Dr N TownlineN Rd !!!!!! !!!!!!!! CutN Rd NO SCALE Whites Ct!!! !!!!!!!!!! !!!! GreatOak Dr ! !!!!!!!!!! !!!!!!! 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