The Dark Energy Survey is an experiment to probe the accelerating universe, with a goal of obtaining ~300 photometric redshifts to z~1. This survey will be carried out with DECam, a 520 megapixel prime-focus imager on the Blanco 4m telescope at CTIO. It has a field of view of 2.2 degrees(!) and is equipped with SDSS-like ugrizY filters.
Though the filters are similar to SDSS, they are not identical. Since stellar photospheric DECam colors are not yet available, I present Phoenix/NextGen BT-Settl Synthetic DECam ugrizY colors with 2MASS JHKS colors mixed in for good measure. These are the latest-greatest models with Asplund et al. (2009) solar composition, obtained from the Phoenix Group's Website. The DECam colors are computed in the AB system.
Currently I offer a limited Teff-log(g)-[m/H] grid of colors. If you need something that is not here, please send me an email (email@example.com) and I'll be glad to try and help! I'm not on the DECam or DES team(s), but computed these colors for my own use and I figured I would share.