Pohman Slough Water Level

Q: What is the water level of Pohman Slough today?

Pohman Slough water levels are measured at USGS gauge Mississippi River at Grafton, IL; the current gauge height updates on this page throughout the day, alongside a 30-day trend.

Q: Is Pohman Slough high or low right now?

This page compares the current reading against the trailing 30-day average and range for Pohman Slough — above the average means higher water than usual, below means lower.

Live gauge height for Pohman Slough, measured at USGS station Mississippi River at Grafton, IL (4.4 mi from the nearest mapped ramp).

Current gauge height

15.79 ft

Updated 52 min ago

vs. 30-day average

-0.30 ft

30-day avg: 16.09 ft

Streamflow

77,600 cfs

30-Day Water Level Trend

2026-09-16Range: 14.40–17.25 ft2026-10-16

Pohman Slough is currently 0.3 ft below its 30-day average — shallow ramps may have less water at the end of the concrete; trim up early and check local reports before launching.

Boat Ramps on Pohman Slough (2)

Pohman Slough — Marshall Landing, Illinois
Pohman Slough — Marshall Landing, Illinois

See all Pohman Slough boat ramps →

Pohman Slough Water Level FAQ

What is the water level of Pohman Slough today?

The USGS gauge for Pohman Slough (Mississippi River at Grafton, IL) currently reads a gauge height of 15.79 feet, 0.3 ft below its 30-day average. Readings update throughout the day from USGS instrumentation.

Is Pohman Slough high or low right now?

Compared with the past 30 days, Pohman Slough is 0.3 ft below its 30-day average.

Where can I launch a boat on Pohman Slough?

BoatLaunchMap lists 2 boat ramps on Pohman Slough, each with directions, ratings, and launch details.

Data: U.S. Geological Survey, station 05587450. Gauge height is measured relative to the station datum, not lake depth. Always verify conditions on site before launching.