1. Zebra Mussel Prevention at Lake Powell
Glen Canyon National Recreation Area

2. Meet the Zebra Mussel Small invasive mussel with varying stripes
Dreissena polymorpha and D. bugensis (quagga mussel)
Small invasive mussel with varying stripes
Attaches to surfaces with byssal threads

3. Cost to Facilities Forms thick mats Fills intake pipes
Clogs trash screens
Encrusts docks, launch ramps, rocks, and anything else in the water

4. Cost to Recreation
Encrusts Boats
Clogs Engines

5. Cost to Recreation Encrusts Boats Clogs Engines
Covers beaches with sharp shells
Fills air with stench of decay

6. Ecological Damage No ecologically friendly way to eradicate
Encrusts and kills any bottom critters (clams, crayfish, …)

7. Ecological Damage No ecologically friendly way to eradicate
Encrusts and kills any bottom critters (clams, crayfish, …)
Filters enormous amounts of algae, disrupting the food chain
No natural predators of consequence
Accumulates toxins: Biomagnification

8. Why Lake Powell?
Considered the most likely point of introduction to the Colorado River System
Good Conditions for Zebra Mussels

9. Why Lake Powell?
Considered the most likely point of introduction to the Colorado River System
Good Conditions for Zebra Mussels
Mussels are transported on boats, in bilge water, in engines, on trailers, with bait

10. Life Cycle

11. History of Invasion From the Caspian and Black Seas
Took over all of Europe

12. History of Invasion From the Caspian and Black Seas
Took over all of Europe
Came to America in ballast water
Discovered in Lake St. Clair in 1988
Moved through the Great Lakes and 8 major rivers in the East

13. Zebra Mussel Spread

14. What is being done for the Colorado River System?
Lake Powell Prevention Program
Utah Aquatic Nuisance Species Action Team
Utah Division of Wildlife Resources
Education through signs and brochures
Boat inspections at 15 State Parks

15. What is being done for the Colorado River System?
Lake Powell Prevention Program
Utah Aquatic Nuisance Species Action Team
Utah Division of Wildlife Resources
Education through signs and brochures
Boat inspections at 15 State Parks
100th Meridian Initiative
National Invasive Species Act (1996)
Forum for multi-agency cooperation
Stop the spread of Aquatic Nuisance Species from East to West at the 100th Meridian

16. Lake Powell Prevention
Monitoring
Screening
Washing

17. Visitor Screening
Has your vessel been used east of the Rocky Mountains in the past 30 days?
In which state(s) or province(s) east of the Rocky Mountains was your vessel used?
Alabama, Arkansas, Illinois, Indiana, Iowa, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, New York, Ohio, Oklahoma, Pennsylvania, Tennessee, Vermont, West Virginia, Wisconsin, Ontario Canada, Quebec Canada

18. Prevention Packet Informative pamphlet Coupon for boat washing
Map to washing facilities

19. Washing Procedure Assume boat is infested Remove any organic matter
High pressure wash
Hull, lines, bumpers, motor, trim tabs, anchor trailer, and all nooks and crannies
Drain and flush any water
>140 degrees F
Bilge, live wells, bait buckets, cooling system

20. Washing Procedure

21. Washing Procedure

22. Prevention Program Results for the 2001 Season
13 potentially infested boats entered
9 were voluntarily washed
Roughly the same as 2000

23. For more information Mark Anderson 928-608-6266 Mark_Anderson@nps.gov
Web Resources

24. National Park Service Mission
Protect resources
Provide recreation
Web Resources