Big off-width outside of Lyons Colorado

Does anyone know anything about that big off-width / chimney on Longmont Dam road by Lyons? Its obvious from the main road heading toward Estes Park but I can't find any info on it.

Type this into google maps for better location detail:

40.238416,-105.319147

Thanks!

In Gillett's Rockclimbing St Vrain Canyons, p. 321, it is route #3 ("Joy," 5.7).

Thanks George!

J