**Heavy rainfall from a stalled frontal system in mid-August 2026 drove exceptional runoff into the White River basin, producing record or near-record crests at upstream gauges that propagated downstream into Indianapolis.** Multiple rounds of thunderstorms dropped over a foot of rain in parts of central Indiana between August 11–17, with NWS and USGS observations confirming crests exceeding 24 feet at Noblesville and Anderson—surpassing 1913 benchmarks. At Indianapolis-area gauges (notably Nora/82nd Street), the river reached a verified peak of 21.18 feet on August 15, just below the historic 22.4-foot mark, while other central Indianapolis sites approached or exceeded 20 feet amid major flooding. By August 21–22, levels had receded well below flood stage (e.g., ~10 feet at Raymond Street and Nora gauges) with no additional heavy precipitation in forecasts, locking in the event peak. Official NWS hydrologic statements and river forecasts from the Ohio River Forecast Center, grounded in observed stages, rainfall totals, and basin conditions, underpin the market-implied odds above 95% for a peak over 20 feet. Realistic challenges to this outcome would require a lower official peak measurement at the precise resolution gauge (e.g., due to differing datum or location) or post-event data revisions, though current verified observations make such shifts unlikely. Trader consensus reflects skin-in-the-game assessment of these confirmed hydrologic data.