John and others,
One of the best ways to get this info is to use eBird to find recent locations 
where this bird has been seen (http://www.ebird.org).  Click on the "Explore 
Data" tab, then select "Range and Point Maps".  From there you can select a 
species, a time span, and a location or just zoom in like on a Google map.  For 
your specific request, you can check out the link below to find the data for 
Marsh Wrens in Colorado.

http://goo.gl/4JRlw


I have limited the scope of the map to approximately the counties you had 
mentioned, and limited the search time span to between June and August for 
better results for this time of year.

The red balloons/markers are for sightings within the last 30 days from today, 
the blue balloons are anything before that.  By clicking on the balloon you can 
get more info about sightings from that location.  

Hope that helps you John, and hopefully others can take advantage of the 
wonderful data source that is eBird.  Good luck on your search.
 
Bryan Guarente
Instructional Designer
The COMET Program
University Corporation for Atmospheric Research
Boulder, CO 



________________________________
 From: John Jones <[email protected]>
To: [email protected] 
Sent: Thursday, July 11, 2013 10:25 AM
Subject: [cobirds] RFI: Marsh Wren
 


Hello all,

I have a friend coming to town and we were planning on doing some birding. She 
is interested in finding a Marsh Wren as we have the western version here. I am 
unsure where a good site for this species is. We are looking for something in 
Jefferson, Arapahoe, or Douglas counties. Does anyone have any suggestions?

Thanks in advance
John Jones
Lakewood, CO
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