How do I trade on “Lowest Mississippi level at St. Louis by November 30?”?

Choose an outcome, enter an amount and confirm the trade. A share’s price is the market’s implied probability; the minimum trade is $1. You can sell your shares at any time before settlement.

What is the trading volume of “Lowest Mississippi level at St. Louis by November 30?”?

The current trading volume is $50K. It updates in real time.

Lowest Mississippi level at St. Louis by November 30?

Q: How will “Lowest Mississippi level at St. Louis by November 30?” be resolved?

The market settles by the actual outcome of the event: shares of the correct outcome pay $1 each. The exact criteria are in the market rules above.

Q: When does “Lowest Mississippi level at St. Louis by November 30?” close?

The expected close is до Dec 2, 2026. You can close your position at any time before settlement.

$50K volume·до Dec 2, 2026

OUTCOMESPROBABILITY · PRICE

Below -3.00 ft$3K volume0123456789%

PriceSharesTotal

-3.00 to -1.01 ft$12K volume01234567890123456789%-10 pp

-1.00 to 0.99 ft$12K volume01234567890123456789%+17 pp

1.00 to 2.99 ft$11K volume01234567890123456789%-3 pp

3.00 ft or more$13K volume0123456789%-1 pp

This market will resolve according to the lowest gage height (river level), in feet, recorded at the Mississippi River at St. Louis, MO streamgage (USGS site 07010000) between market creation and November 30, 2026, as published by the United States Geological Survey (USGS) for parameter code 00065 under statistic code 30800. Exactly one outcome in this market will resolve to "Yes".

The lowest daily reading in the window decides this market; the level does not need to be sustained. If USGS does not publish a reading for one or more days, this market will resolve according to the lowest reading among the days that are published.

Values will be used exactly as published by USGS, without rounding. USGS reports gage height at this gage to 2 decimal places. Each range includes both of its stated bounds and consecutive ranges are contiguous, so every reading falls in exactly one range: a lowest reading of exactly -1.00 ft resolves the range beginning at -1.00 ft to "Yes" and every other range to "No".

This market will resolve on the values published at the time of resolution, whether flagged provisional ("P") or approved ("A"); revisions published afterward will not be considered, except where the correction provision below applies.

If any data remains unpublished or unfinalized, this market will remain open for up to 2 calendar days (ET) after November 30, 2026; it will then resolve based on the finalized data published up to that point.

In case of obvious data integrity issues (i.e., erroneous data), the market may remain open until the end of the third calendar day (ET) after such data is first released to allow for corrections; this applies only to clerical or similar errors, not to USGS differing from other sources.

If the source is unavailable, this market may be extended to December 15, 2026, 11:59 PM ET. If no data for the window is available by then, this market will resolve to "Below -3.00 ft".

The primary resolution source for this market will be the USGS Daily Values service for site 07010000; however, a consensus of credible reporting may also be used. The service is available here: https://waterservices.usgs.gov/nwis/dv/?sites=07010000&parameterCd=00065&statCd=30800&startDT=2026-09-21&endDT=2026-11-30&format=rdb

✓Market open for trading

Proposed outcome

Final review

Questions and answers

“Lowest Mississippi level at St. Louis by November 30?” is a prediction market on Melbo. A share’s price reflects the probability of the outcome: on the correct outcome each share settles at $1, on the wrong one at $0.