1. Houghton Lake Management Plan Michigan Lake and Stream Associations April 2009

2. Physical Characteristics Lake Surface Area (acres)20,044 Maximum Depth (feet)21 Mean Depth (feet)8.6 Lake Volume (acre-feet)172,463 Shoreline Length (miles)35 Shoreline Development Factor1.8 Watershed Area (square miles)172 Ratio of Lake Area to Watershed Area1 : 5.5

6. 1616.619 10617.719 TempDissolvedTotal Depth(F)OxygenPhosphorus

7. Plant Survey Sites Grid Survey Locations

8. Aquatic Plant Surveys July 24 – August 1, 2001 August 19-20, 2002 August 4-6, 2003 August 23-26, 2004 August 22-24, 2005 August 21-23, 2006 August 20-22, 2007 Augsut 12-13, 2008

9. Robbins pondweed Thinleaf pondweed Eurasian milfoil Flat-stem pondweed Richardson’s pondweed Curly-leaf pondweed Whitestem pondweed Water stargrass Illinois pondweed Water stargrass Large-leaf pondweed

10. Estimated Plant Coverage: 2008 447 sites with plants Approximately 50% of lake area 25 plant species found

11. Eurasian Milfoil

12. Lake Board Established 2000 Includes representatives for all local governmental units Determined the scope of improvements necessary to protect or improve Houghton Lake Established a special assessment district to finance the improvements Prepares, assembles and computes statistical data on the status of the lake

14. Study Findings 10,800 acres of milfoil in 2001 Common or dense in 5,300 acres 21 other plants also Milfoil most abundant

16. 2000 Satellite imagery from altitude 423 miles above earth

17. 2002

19. Plant Control History Herbicides (acres treated)Acres# Weevils SonarContactsSystemicHarvestedStocked 200220,04417 200332 200444815,000 2005503958428,000 200659444105 200710666030,000 2008201,31035

21. Watershed Management Houghton Lake Guidebook Storm Sewer Inventory Uniform Storm Water Regulations Phosphorus Fertilizer Ordinance Information and Education

22. Update lake residents on progress Newspaper – Newsletter & Special Report Email over 600 Publish reports – Assist other lakes & organizations Produce “Houghton Lake” CD

26. Assessment District Revenue Generated 64.6% Water front –Lake – River – Canal (50.7% of parcels) 22.2 % Back Lot About a 6 iron from the water (38.5% of parcels) 13.2 % Commercial (10.8% of parcels)

27. What’s Next? Continue programs to improve and protect Houghton Lake. Questions... ?