The Los Angeles Times has mapped LA's broken sidewalks. Or you can also download illustrator for free of Mountain View, California, Free Printable Map in Adobe Illustrator and PDF. Level 12 (5000 meter scale) map, G-VIEW, fully editable. Over the last five years the city's 311 service request system has received 19,000 sidewalk complaints. The LA Times has mapped them all.
The Broken Sidewalks map colors the city's roads by the number of sidewalk complaints filed on each section of road. You can mouse-over the roads to view exactly how many sidewalk service requests were made for the selected block. If you zoom out you can view a choropleth map showing the number of complaints filed by neighborhood.
The LA Times reports that only about in about 60% of reported cases were repairs made to the broken sidewalks. Source