This dataset contains topographic (horizontal and vertical) data for 20 sites, surveyed November 6 to November 28, 2017 as part of documentation of flooding that occurred in Puerto Rico during and after Hurricane Maria (September to November 2017). Hurricane Maria hit the Island of Puerto Rico on September 20, 2017 and was one of the deadliest storms in U.S. history. USGS personnel conducted topographic surveys at selected stream sites to facilitate hydraulic modeling of peak streamflows (or discharges) – termed indirect measurements – using published standard USGS methods. Indirect (post-flood) measurements are used to characterize flood peaks that could not be determined using direct methods (for example current-velocity meters, hydro-acoustic instruments or established stage-streamflow relations) because flood conditions exceeded the capabilities of those methods, streamgage sites could not be accessed during flooding, or safety issues precluded access by USGS personnel during flooding. Indirect measurement of peak streamflow involves site reconnaissance to identify a study reach; onsite identification and flagging of high water marks (HWMs) left by the flood; topographic surveys of HWMs, channel cross-section geometry, and affected structures (such as bridges or flooded roadways); and hydraulic modeling to compute peak streamflow using field data collected at the site.