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Here we present new red sequence overdensity measurements for 77 fields inthe high-$z$ Clusters Occupied by Bent Radio AGN (COBRA) survey, based on $r$-and $i$-band imaging taken with Lowell Observatory's Discovery ChannelTelescope. We observe 38 COBRA fields in $r$-band and 90 COBRA fields in$i$-band. By combining the $r$- and $i$-band photometry with our 3.6$\mu$m and4.5$\mu$m $Spitzer$ IRAC observations, we identify 39 red sequence clustercandidates that host a strong overdensity of galaxies when measuring the excessof red sequence galaxies relative to a background field. We initially treat theradio host as the cluster center and then determine a new cluster center basedon the surface density of red sequence sources. Using our color selection, weidentify which COBRA cluster candidates have strong red sequence populations.By removing foreground and background contaminants, we more securely determinewhich fields include cluster candidates with a higher significance than oursingle-band observations. Additionally, of the 77 fields we analyze with aredshift estimate, 26 include newly estimated photometric redshifts.

The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Follow-Up Optical Imaging