Case study: Before & After the Flood of '98. The interactive map shows changes in the Guadalupe River from 1996 to 2023. The river is very much alive and continues to change. 2023 experienced a bad drought which is very noticable in the photos. Click on the map below to bring up the interactive map. Once the map opens in a new window, at the bottom right - open layer list and click on: 60cm 2020 NAIP color imagery.