That ridge is actually part of the Huerfano approach to Blanca. I believe Dawson has it detailed in one of his 14er books. Gash Ridge starts about 1/4 left of Blanca's summit, out of view from this vantage.
There's also an old mine right smack at the bottom of the massive eastern face of Blanca that isn't on any topo's (well, at least not on mine). :o)
you even included a leading line with the stream right up to Blanca