Mississippi River at Mel Price (Alton) Lock and Dam
The Mississippi River at Mel Price (Alton) Lock and Dam read 17.25 ft at .
- Newest reading
- 17.25 ftProvisional
- Change
- +4.35 ft in a day
- +4.04 ft in a week
That is below the action stage of 19 ft set by the National Weather Service.
The last 31 days
- Level
- Our record
Table: The last 31 days
| Day | Daily average (ft) |
|---|---|
| no value | |
| 3.30 ft | |
| 3.19 ft | |
| 2.91 ft | |
| 2.76 ft | |
| 2.64 ft | |
| 2.79 ft | |
| 3.16 ft | |
| 3.53 ft | |
| 4.68 ft | |
| 4.90 ft | |
| 3.97 ft | |
| 3.64 ft | |
| 4.26 ft | |
| 5.46 ft | |
| 6.52 ft | |
| 7.72 ft | |
| 9.05 ft | |
| 10.45 ft | |
| 11.94 ft | |
| 12.16 ft | |
| 12.80 ft | |
| 13.21 ft | |
| 13.44 ft | |
| 13.17 ft | |
| 12.08 ft | |
| 11.07 ft | |
| 9.91 ft | |
| 9.25 ft | |
| 10.64 ft | |
| 13.33 ft |
Normal range and official levels
- Action stage: 19 ft. The newest reading is 1.75 ft below it.Set by NOAA National Water Prediction Service (NWPS).
- Minor flood stage: 21 ft. The newest reading is 3.75 ft below it.Set by NOAA National Water Prediction Service (NWPS).
- Moderate flood stage: 29 ft. The newest reading is 11.75 ft below it.Set by NOAA National Water Prediction Service (NWPS).
- Major flood stage: 34 ft. The newest reading is 16.75 ft below it.Set by NOAA National Water Prediction Service (NWPS).
Records
- Highest reading in our series since 4 September 2026: 15.06 ft at 17:30 CDT on 4 October 2026. Provisional data.
- Lowest reading in our series since 4 September 2026: 2.51 ft at 12:30 CDT on 9 September 2026. Provisional data.
- Highest daily average in our series since 4 September 2026: 13.44 ft on 27 September 2026. Provisional data.
- Lowest daily average in our series since 4 September 2026: 2.64 ft on 9 September 2026. Provisional data.
About this gauge
Mel Price (Alton) Lock and Dam is a gauge on the Mississippi River in Illinois, United States.
It lies at 38.8664° N, 90.1464° W.
Its readings come from the National Weather Service (NWPS).
The gauge reads the height of the water above a fixed zero, not the depth of the river.
The newest reading is provisional: the source may still correct it.
The National Weather Service credits: U.S. Army Corps of Engineers (RiverGages.com).