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ALT Satellite imagery showing a stretch of the Illinois River near Starved Rock. The image was generated by the USGS Remote Sensing Water Quality (RSWQ) Web Tool and was used to guide field crews sampling the Illinois River algal bloom conditions during the week of September 9-13, 2024 (credit: screen capture by Jim Duncker).

ALT Harmful Algal Bloom (HAB) 🌊🦠: Transform into a vibrant, glowing algal bloom with green, blue and tie-dye fabric. Add a glow stick to mimic the eeriness of this bright neon phenomena. Learn more about USGS HABs research at https://www.usgs.gov/publications/interdisciplinary-science-approach-harmful-algal-blooms-habs-and-algal-toxins-a.

ALT Hydraulic Imagery Vizualization and Information System (HIVIS) camera 📸: Blend in with your surroundings with a cool gray outfit, and accessorize with some round spectacles and of course, a camera! Take some photos of your surroundings at your Halloween party and share them online, such as at https://apps.usgs.gov/hivis/.

ALT Snow-covered streamgage ❄📏: Bundle up in gray snowpants and a USGS-logo shirt, and throw on a white fluffy coat to represent a snowy scene. Complete the look with a shovel and measuring tape to represent the gage measurements! See streamgage data in your area at https://dashboard.waterdata.usgs.gov/.

ALT Salmon, trout or bass 💦🐟: Use bright, shimmering and sequin fabrics to mimic fish scales. Think blues, greens, and oranges! Add a pop of color with a bright USGS-logo hat and ribbon for fins and tail! Learn more about fish monitoring in Milwaukee, Wisconsin-area streams at https://www.usgs.gov/centers/upper-midwest-water-science-center/science/mmsd-watercourse-corridor-study-geomorphology.

























