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Mississippi River At Mel Price (Alton) Lock and Dam (ALNI2)

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

NOTE: For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.

Flood Stage: 21 Feet

Latest Stage: 10.11

Current Warnings/Statements/Advisories:None currently.

Complete information about the Mississippi River at Mel Price (Alton) Lock and Dam available from NWS St. Louis, MO

NOTE:Forecasts for the Mississippi River at Mel Price (Alton) Lock and Dam are issued routinely year-round.

Flood Categories (in feet)

Major Flood Stage:	34
Moderate Flood Stage:	29
Flood Stage:	21
Action Stage:	19
Low Stage (in feet):	-9999

Historic Crests
(1) 42.72 ft on 08/01/1993
(2) 39.01 ft on 06/09/2019
(3) 36.90 ft on 06/18/1844
(4) 36.89 ft on 04/28/1973
(5) 35.80 ft on 01/01/2016
(6) 35.10 ft on 05/22/1995
(7) 34.86 ft on 05/06/2017
(8) 34.38 ft on 06/04/2013
(9) 34.20 ft on 10/09/1986
(10) 33.21 ft on 05/01/1983
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23.17 ft on 06/28/2021
(2) 22.90 ft on 04/14/2021
(3) 25.04 ft on 03/20/2021
(4) 25.14 ft on 06/01/2020
(5) 22.16 ft on 05/19/2020
(6) 22.32 ft on 04/30/2020
(7) 23.72 ft on 03/25/2020
(8) 23.33 ft on 01/13/2020
(9) 21.55 ft on 11/02/2019
(10) 21.17 ft on 11/01/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 11/07/1948
(2) 0.10 ft on 01/15/2003
(3) 0.73 ft on 01/16/2003
Show More Low Water Records

Observed and Forecast Stages

Observed Data:

Date (UTC)

Stage

Flow

04/23 08:30

10.11 ft

04/23 08:00

10.1 ft

04/23 07:30

10.1 ft

04/23 07:00

10.09 ft

04/23 06:30

10.09 ft

04/23 06:00

10.05 ft

04/23 05:30

10.05 ft

04/23 05:00

10.02 ft

04/23 04:30

9.99 ft

04/23 04:00

9.97 ft

04/23 03:30

9.95 ft

04/23 03:00

9.94 ft

04/23 02:30

9.89 ft

04/23 02:00

9.83 ft

04/23 01:30

9.77 ft

04/23 01:00

9.69 ft

04/23 00:30

9.54 ft

04/23 00:00

10.23 ft

04/22 09:30

10.23 ft

04/22 09:00

10.23 ft

04/22 08:30

10.23 ft

04/22 08:00

10.24 ft

04/22 07:30

10.26 ft

04/22 07:00

10.26 ft

04/22 06:30

10.26 ft

04/22 06:00

10.28 ft

04/22 05:30

10.28 ft

04/22 05:00

10.29 ft

04/22 04:30

10.29 ft

04/22 04:00

10.31 ft

04/22 03:30

10.34 ft

04/22 03:00

10.39 ft

04/22 02:30

10.46 ft

04/22 02:00

10.54 ft

04/22 01:30

10.59 ft

04/22 01:00

10.71 ft

04/22 00:30

10.82 ft

04/22 00:00

10.83 ft

04/21 23:30

10.83 ft

04/21 23:00

10.83 ft

04/21 22:30

10.83 ft

04/21 22:00

10.84 ft

04/21 21:30

10.85 ft

04/21 21:00

10.83 ft

04/21 20:30

10.81 ft

04/21 20:00

10.81 ft

04/21 19:30

10.82 ft

04/21 19:00

10.82 ft

04/21 18:30

10.8 ft

04/21 18:00

10.82 ft

04/21 17:30

10.82 ft

04/21 17:00

10.81 ft

04/21 16:30

10.82 ft

04/21 16:00

10.81 ft

04/21 15:30

10.81 ft

04/21 15:00

10.82 ft

04/21 14:30

10.81 ft

04/21 14:00

10.82 ft

04/21 13:30

10.83 ft

04/21 13:00

10.83 ft

04/21 12:30

10.82 ft

04/21 12:00

10.82 ft

04/21 11:30

10.82 ft

04/21 11:00

10.82 ft

04/21 10:30

10.86 ft

04/21 10:00

10.9 ft

04/21 09:30

10.89 ft

04/21 09:00

10.9 ft

04/21 08:30

10.89 ft

04/21 08:00

10.94 ft

04/21 07:30

10.94 ft

04/21 07:00

10.96 ft

04/21 06:30

10.98 ft

04/21 06:00

10.99 ft

04/21 05:30

10.98 ft

04/21 05:00

11.01 ft

04/21 04:30

11.02 ft

04/21 04:00

11.02 ft

04/21 03:30

11.01 ft

04/21 03:00

11.02 ft

04/21 02:30

11.03 ft

04/21 02:00

11.03 ft

04/21 01:30

11.05 ft

04/21 01:00

11.08 ft

04/21 00:30

11.09 ft

04/21 00:00

11.23 ft

04/20 00:30

11.23 ft

04/20 00:00

9.53 ft

04/19 00:30

9.53 ft

04/19 00:00

9.11 ft

04/18 02:30

9.11 ft

04/18 02:00

9.12 ft

04/18 01:30

9.15 ft

04/18 01:00

9.15 ft

04/18 00:30

9.16 ft

04/18 00:00

9.18 ft

04/17 23:30

9.22 ft

04/17 23:00

9.28 ft

04/17 22:30

9.34 ft

04/17 22:00

9.42 ft

04/17 21:30

9.5 ft

04/17 21:00

9.56 ft

04/17 20:30

9.63 ft

04/17 15:30

9.7 ft

04/17 15:00

9.7 ft

04/17 14:30

9.67 ft

04/17 14:00

9.63 ft

04/17 13:30

9.62 ft

04/17 13:00

9.61 ft

04/17 12:30

9.6 ft

04/17 12:00

9.59 ft

04/17 11:30

9.56 ft

04/17 11:00

9.54 ft

04/17 10:30

9.52 ft

04/17 10:00

9.49 ft

04/17 09:30

9.5 ft

04/17 09:00

9.5 ft

04/17 08:30

9.5 ft

04/17 08:00

9.49 ft

04/17 07:30

9.49 ft

04/17 07:00

9.48 ft

04/17 06:30

9.48 ft

04/17 06:00

9.48 ft

04/17 05:30

9.47 ft

04/17 05:00

9.47 ft

04/17 04:30

9.48 ft

04/17 04:00

9.47 ft

04/17 03:30

9.47 ft

04/17 03:00

9.47 ft

04/17 02:30

9.47 ft

04/17 02:00

9.47 ft

04/17 01:30

9.47 ft

04/17 01:00

9.47 ft

04/17 00:30

9.48 ft

04/17 00:00

9.45 ft

04/16 23:30

9.42 ft

04/16 23:00

9.39 ft

04/16 22:30

9.37 ft

04/16 22:00

9.35 ft

04/16 21:30

9.31 ft

04/16 21:00

9.3 ft

04/16 20:30

9.32 ft

04/16 20:00

9.32 ft

04/16 19:30

9.34 ft

04/16 19:00

9.36 ft

04/16 18:30

9.36 ft

04/16 18:00

9.36 ft

04/16 17:30

9.36 ft

04/16 17:00

9.34 ft

04/16 16:30

9.34 ft

04/16 16:00

9.35 ft

04/16 15:30

9.34 ft

04/16 15:00

9.32 ft

04/16 14:30

9.33 ft

04/16 14:00

9.34 ft

04/16 13:30

9.35 ft

04/16 13:00

9.36 ft

04/16 12:30

9.38 ft

04/16 12:00

9.4 ft

04/16 11:00

9.4 ft

04/16 10:30

9.42 ft

04/16 10:00

9.4 ft

04/16 09:30

9.41 ft

04/16 09:00

9.41 ft

04/16 08:30

9.41 ft

04/16 08:00

9.43 ft

04/16 07:30

9.42 ft

04/16 07:00

9.42 ft

04/16 06:30

9.42 ft

04/16 06:00

9.43 ft

04/16 05:30

9.44 ft

04/16 05:00

9.43 ft

04/16 04:30

9.43 ft

04/16 04:00

9.45 ft

04/16 03:30

9.46 ft

04/16 03:00

9.44 ft

04/16 02:30

9.44 ft

04/16 02:00

9.44 ft

04/16 01:30

9.44 ft

04/16 01:00

9.44 ft

04/16 00:30

9.43 ft

04/16 00:00

9.49 ft

04/15 22:00

9.49 ft

04/15 21:30

9.51 ft

04/15 21:00

9.51 ft

04/15 20:30

9.52 ft

04/15 20:00

9.5 ft

04/15 19:30

9.5 ft

04/15 19:00

9.5 ft

04/15 18:30

9.51 ft

04/15 18:00

9.52 ft

04/15 17:30

9.54 ft

04/15 17:00

9.55 ft

04/15 16:30

9.57 ft

04/15 16:00

9.6 ft

04/15 15:30

9.6 ft

04/15 15:00

9.6 ft

04/15 14:30

9.6 ft

04/15 14:00

9.61 ft

04/15 13:30

9.6 ft

04/15 13:00

9.6 ft

04/15 12:30

9.6 ft

04/15 12:00

9.6 ft

04/15 11:30

9.62 ft

04/15 11:00

9.62 ft

04/15 10:30

9.63 ft

04/15 10:00

9.63 ft

04/15 09:30

9.64 ft

04/15 09:00

9.64 ft

04/15 08:30

9.67 ft

04/15 08:00

9.68 ft

04/15 07:30

9.71 ft

04/15 07:00

9.76 ft

04/15 04:30

9.78 ft

04/15 04:00

9.78 ft

04/15 03:30

9.79 ft

04/15 03:00

9.77 ft

04/15 02:30

9.77 ft

04/15 02:00

9.77 ft

04/15 01:30

9.78 ft

04/15 01:00

9.8 ft

04/15 00:30

9.8 ft

04/15 00:00

9.78 ft

04/14 23:30

9.79 ft

04/14 23:00

9.79 ft

04/14 22:30

9.78 ft

04/14 22:00

9.79 ft

04/14 21:30

9.8 ft

04/14 21:00

9.8 ft

04/14 20:30

9.79 ft

04/14 20:00

9.8 ft

04/14 19:30

9.79 ft

04/14 19:00

9.8 ft

04/14 18:30

9.81 ft

04/14 18:00

9.79 ft

04/14 17:30

9.8 ft

04/14 17:00

9.8 ft

04/14 16:30

9.79 ft

04/14 16:00

9.78 ft

04/14 15:30

9.73 ft

04/14 15:00

9.7 ft

04/14 14:30

9.67 ft

04/14 14:00

9.67 ft

04/14 13:30

9.68 ft

04/14 13:00

9.71 ft

04/14 12:30

9.7 ft

04/14 12:00

9.72 ft

04/14 11:30

9.75 ft

04/14 11:00

9.76 ft

04/14 10:30

9.74 ft

04/14 10:00

9.73 ft

04/14 09:30

9.74 ft

04/14 09:00

9.74 ft

04/14 08:30

9.75 ft

04/14 08:00

9.75 ft

04/14 07:30

9.74 ft

04/14 07:00

9.75 ft

04/14 06:30

9.76 ft

04/14 06:00

9.75 ft

04/14 05:30

9.76 ft

04/14 05:00

9.77 ft

04/14 04:30

9.79 ft

04/14 04:00

9.79 ft

04/14 03:30

9.79 ft

04/14 03:00

9.79 ft

04/14 02:30

9.78 ft

04/14 02:00

9.78 ft

04/14 01:30

9.79 ft

04/14 01:00

9.78 ft

04/14 00:30

9.78 ft

04/14 00:00

9.84 ft

Forecast Data:

Date (UTC)

Stage

Flow

04/23 12:00

9.7 ft

04/23 18:00

9.7 ft

04/24 00:00

9.7 ft

04/24 06:00

9.7 ft

04/24 12:00

9.6 ft

04/24 18:00

9.6 ft

04/25 00:00

9.6 ft

04/25 06:00

9.6 ft

04/25 12:00

9.5 ft

04/25 18:00

9.5 ft

04/26 00:00

9.5 ft

04/26 06:00

9.4 ft

04/26 12:00

9.4 ft

04/26 18:00

9.3 ft

04/27 00:00

9.3 ft

04/27 06:00

9.3 ft

04/27 12:00

9.3 ft

04/27 18:00

9.3 ft

04/28 00:00

9.2 ft

04/28 06:00

9.2 ft

04/28 12:00

9.2 ft

04/28 18:00

9.2 ft

04/29 00:00

9.2 ft

04/29 06:00

9.1 ft

04/29 12:00

9.1 ft

04/29 18:00

9.1 ft

04/30 00:00

9 ft

04/30 06:00

9 ft

04/30 12:00

9 ft

04/30 18:00

8.9 ft

05/01 00:00

8.8 ft

05/01 06:00

8.8 ft

05/01 12:00

8.7 ft

05/01 18:00

8.7 ft

05/02 00:00

8.6 ft

05/02 06:00

8.5 ft

05/02 12:00

8.5 ft

05/02 18:00

8.4 ft

05/03 00:00

8.3 ft

05/03 06:00

8.3 ft

05/03 12:00

8.2 ft

05/03 18:00

8.2 ft

05/04 00:00

8.1 ft

05/04 06:00

8 ft

05/04 12:00

8 ft

05/04 18:00

7.9 ft

05/05 00:00

7.9 ft

05/05 06:00

7.8 ft

05/05 12:00

7.7 ft

05/05 18:00

7.6 ft

05/06 00:00

7.6 ft

05/06 06:00

7.5 ft

05/06 12:00

7.4 ft

05/06 18:00

7.3 ft

05/07 00:00

7.3 ft

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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Page last modified: 23-Jun-2020 5:16 PM

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