Greetings... I  can't remember, but I know I've read posts from members to 
this list or the AMV list regarding Great Blue Heron rookeries in Butler and 
possibly Preble Counties. Does anyone know how many rookeries there are in 
the area? How large they might be, and how long they've been active?

There's an active rookery in Mason in Warren County, just east of the Butler 
County line. I'm not sure how long it's been around, but a couple local 
birder/photographers from the Cincinnati area visit the site regularly.
http://cincinnatibirds.com/message/showthread.php?Thread=484

I was wondering about the other local sites.

I'm not planning pilgrimages, stealth visits to private property, etc., I am 
merly curious.

Thanks.

Incidentally, there's a Red-tailed Hawk nest at Gilmore Ponds, along the 
canal and ditches west of the Gilmore Road parking lot. It's in a 20-acre 
parcel that MetroParks bought a couple years back with help from Clean Ohio 
Funds. Governor Taft's legacy is decidedly mixed, but the Clean Ohio Fund 
has had good results, I think.

Take care,
---Mike Busam
West Chester, OH