April 18, 2015

Chris Tschinkel and the crew are working hard all over the North Fork District using various forms of physical mitigation to open up drainage, remove beaver dams, clear out irrigation water pathways, etc., all to avoid potential mosquito breeding habitat formation.  Some of these areas are well known hotspots from previous seasons, problems observed over the course of treatment and surveillance, or new findings as the crew continues to search for the causes behind adult mosquito hatches.

Physical mitigation is done using backhoe, track hoe, and shovel crews, along with the trapping and relocation of animals such as beavers.  How is your property?  NFMAD Field manager, Chris Tschinkel, is available to evaluate your site, to assess the best possible approach to decreasing mosquito breeding habitat while keeping the free flow of water moving off the mesas and heading back to the river.

Call the NFMAD voicemail line, 970-527-6681 to schedule with Chris.



Beaver dams are a huge issue in the North Fork District, creating swampy areas that are perfect for breeding mosquitoes of all species.

NFMAD is currently using trackhoes to physically break up and remove beaver dams, while also trapping and relocating the beavers whenever possible.  This requires a two-phase approach of destroying the dam, and within one week, returning to again remove all dam materials.

Do you have beaver damage on your property?  Whenever the free flow of water is obstructed, mosquito breeding habitat can result in short order!


The use of fire in a controlled burn to open up drainage of water and decrease mosquito habitat MUST be utilized with extreme caution, under the supervision of the Fire Department.  The weather conditions must be within narrow parameters to safely burn off a ditch or weed-choked area that is blocking the free flow of water.  Contact the Field Manager for options on this form of physical mitigation.


Every property owner has the power to decrease mosquito breeding habitat by cleaning up ponds, drainage ditches, and irrigation waterways.  It is also imperative to remove all forms of standing water, including changing bird baths, and planter bottoms regularly.  Even something as simple as a vase of flowers left outside is enough water for many mosquito species to lay eggs!  Culex species that carry West Nile Virus are known to lay eggs in as little as two inches of water in a boot or hoof print.


Any blockage of the free flow of water, whether it is rainfall or irrigation, or just a hose left running, will cause temporary mosquito breeding habitat!  Be aware of protecting yourself and your family by policing your own garden, decks, fields, and livestock areas.  Noticing a problem off-site?  Give the Field Manager a call at 970-527-6681 so NFMAD crew can check the area for issues, and find a solution BEFORE adult mosquitoes hatch.