Colony is in native blackberry with some sparse emergent marsh vegetation (cattail?). Surrounding landscape is grassland pasture and a vineyard.
Sex ratio estimated as 50:50 but this is a very rough estimate. At times seemed dominated by males and at other times seemed dominated by females. Often could see relatively even number of males and females.
On the drive away from the site, I encountered several hundred Tricolored Blackbirds foraging in what appeared to be some sort of non-functioning agricultural operation (about 1.25 km away from the site on County Road 16). A couple modern warehouse-like structures. Also, there were a few horses at the site so it is possible that there were waste grains present.
This site should be approached from the west (off Hwy 505). I tried initially from I-5 and had a difficult time on a small dirt road and eventually had to turn back due to flooding.