That number no longer works. It gets you a generic “Cisco Messaging Service” message. I can tell you that I’ve put in somewhere around 10 separate requests through both 311 and SeeClickFix to clean the rock piles out from the 11th St SE bike lanes between M St SE and O St SE. I’ve had them closed with a note that sweeping was done even though the rock piles didn’t lose a single rock, I have some still open months later, and some were closed with no explanation whatsoever.
In the end, the only rocks that have moved since August 2017 have been the ones I personally hand swept.