Winnebago River at Mason City
No watches, warnings or advisories are in effect for this area.
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/13/2025 4:00 AM CDTOfficial Forecast (FCST) 06/13/2025 2:02 AM CDTRecord: 18.7 ftCATEGORY STAGE 
Major Flooding 15.5 ft Moderate Flooding 14.5 ft Minor Flooding 10 ft Action 8 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 20.5 - Water affects the floodwall at the water treatment plant located at 13th St NE.
- 17.4 - Water reaches bottom of railroad bridge east of Kentucky Ave bridge.
- 15 - This is the approximate top of levee protection. Levees run from the 12th St NE bridge to 9th St along the east bank and also from 8th St to 6th St and Hampshire St.
- 14 - Water may flow over the city dikes.
- 12 - Widespread flooding occurs along the river. Some backwater effects are possible along Willow Creek between downtown Mason City and the confluence with the Winnebago river.
- 11 - Sandbagging occurs on the dike from 12th St NE to Carolina St.
- 10 - Widespread flooding occurs at city parks. Water reaches the underside of the 12th St NE bridge at the piers.
- 8 - Water affects east and west city parks in the 12th St NE area.
- 7 - Water affects low-lying areas along the river.
Gauge Location
Recent Crests
| 1. | 10.98 ft | on 06-22-2024 |
| 2. | 11.24 ft | on 02-27-2023 |
| 3. | 10.91 ft | on 04-13-2022 |
| 4. | 5.78 ft | on 08-28-2021 |
| 5. | 7.34 ft | on 03-05-2020 |
| 6. | 7.27 ft | on 10-06-2019 |
| 7. | 10.42 ft | on 03-20-2019 |
| 8. | 10.54 ft | on 03-17-2019 |
| 9. | 12.17 ft | on 09-21-2018 |
| 10. | 7.14 ft | on 02-21-2017 |
Recent Crests
| 1. | 10.98 ft | on 06-22-2024 |
| 2. | 11.24 ft | on 02-27-2023 |
| 3. | 10.91 ft | on 04-13-2022 |
| 4. | 5.78 ft | on 08-28-2021 |
| 5. | 7.34 ft | on 03-05-2020 |
| 6. | 7.27 ft | on 10-06-2019 |
| 7. | 10.42 ft | on 03-20-2019 |
| 8. | 10.54 ft | on 03-17-2019 |
| 9. | 12.17 ft | on 09-21-2018 |
| 10. | 7.14 ft | on 02-21-2017 |
| 11. | 14.07 ft | on 09-22-2016 |
| 12. | 7.10 ft | on 06-22-2015 |
| 13. | 9.36 ft | on 06-20-2014 |
| 14. | 9.44 ft | on 05-20-2013 |
| 15. | 5.47 ft | on 05-06-2012 |
| 16. | 7.55 ft | on 03-23-2011 |
| 17. | 11.20 ft | on 03-12-2010 |
| 18. | 6.74 ft | on 02-11-2009 |
| 19. | 18.74 ft | on 06-08-2008 |
| 20. | 9.47 ft | on 03-15-2007 |
| 21. | 7.06 ft | on 04-03-2006 |
| 22. | 10.84 ft | on 04-19-2005 |
| 23. | 14.67 ft | on 05-22-2004 |
| 24. | 6.84 ft | on 05-11-2003 |
| 25. | 6.92 ft | on 08-06-2002 |
| 26. | 11.83 ft | on 04-12-2001 |
| 27. | 6.76 ft | on 06-16-2000 |
| 28. | 11.84 ft | on 07-21-1999 |
| 29. | 8.01 ft | on 06-24-1998 |
| 30. | 9.32 ft | on 03-11-1997 |
| 31. | 6.34 ft | on 03-25-1996 |
| 32. | 6.81 ft | on 06-07-1995 |
| 33. | 7.26 ft | on 07-16-1994 |
| 34. | 12.59 ft | on 04-01-1993 |
| 35. | 8.25 ft | on 03-09-1992 |
| 36. | 11.58 ft | on 05-18-1991 |
| 37. | 7.86 ft | on 08-25-1990 |
| 38. | 5.30 ft | on 03-11-1989 |
| 39. | 4.67 ft | on 04-29-1988 |
| 40. | 9.40 ft | on 03-18-1986 |
| 41. | 6.48 ft | on 03-11-1985 |
| 42. | 11.94 ft | on 06-08-1984 |
| 43. | 8.88 ft | on 03-07-1983 |
| 44. | 9.16 ft | on 06-07-1982 |
| 45. | 10.90 ft | on 06-24-1981 |
| 46. | 11.66 ft | on 05-30-1980 |
| 47. | 11.33 ft | on 08-23-1979 |
| 48. | 7.36 ft | on 06-15-1978 |
| 49. | 4.26 ft | on 05-05-1977 |
| 50. | 9.00 ft | on 03-12-1976 |
| 51. | 10.48 ft | on 04-28-1975 |
| 52. | 7.26 ft | on 03-03-1974 |
| 53. | 9.37 ft | on 03-11-1973 |
| 54. | 6.65 ft | on 09-28-1972 |
| 55. | 8.24 ft | on 04-01-1971 |
| 56. | 6.84 ft | on 05-30-1970 |
| 57. | 12.25 ft | on 07-08-1969 |
| 58. | 7.30 ft | on 06-27-1968 |
| 59. | 6.00 ft | on 06-10-1967 |
| 60. | 8.52 ft | on 02-09-1966 |
| 61. | 14.27 ft | on 04-11-1965 |
| 62. | 4.85 ft | on 09-09-1964 |
| 63. | 8.86 ft | on 07-19-1963 |
| 64. | 13.06 ft | on 08-31-1962 |
| 65. | 14.80 ft | on 03-27-1961 |
| 66. | 5.98 ft | on 03-28-1960 |
| 67. | 7.33 ft | on 05-21-1959 |
| 68. | 3.83 ft | on 06-04-1958 |
| 69. | 3.58 ft | on 05-30-1957 |
| 70. | 4.15 ft | on 04-01-1956 |
| 71. | 5.75 ft | on 06-03-1955 |
| 72. | 11.85 ft | on 06-21-1954 |
| 73. | 4.73 ft | on 08-03-1953 |
| 74. | 8.70 ft | on 03-30-1952 |
| 75. | 12.44 ft | on 04-07-1951 |
| 76. | 7.30 ft | on 03-07-1950 |
| 77. | 7.40 ft | on 03-04-1949 |
| 78. | 11.22 ft | on 02-28-1948 |
| 79. | 8.80 ft | on 06-30-1947 |
| 80. | 6.90 ft | on 03-14-1946 |
| 81. | 10.22 ft | on 03-11-1945 |
| 82. | 12.20 ft | on 06-12-1944 |
| 83. | 7.93 ft | on 03-16-1943 |
| 84. | 5.80 ft | on 11-01-1941 |
| 85. | 4.40 ft | on 06-02-1941 |
| 86. | 3.40 ft | on 03-29-1940 |
| 87. | 7.90 ft | on 03-13-1939 |
| 88. | 10.29 ft | on 06-25-1938 |
| 89. | 9.68 ft | on 03-05-1937 |
| 90. | 6.10 ft | on 03-16-1936 |
| 91. | 5.80 ft | on 03-05-1935 |
| 92. | 4.10 ft | on 04-03-1934 |
| 93. | 15.70 ft | on 03-30-1933 |
Historic Crests
| 1. | 18.74 ft | on 06-08-2008 |
| 2. | 15.70 ft | on 03-30-1933 |
| 3. | 14.80 ft | on 03-27-1961 |
| 4. | 14.67 ft | on 05-22-2004 |
| 5. | 14.27 ft | on 04-11-1965 |
| 6. | 14.07 ft | on 09-22-2016 |
| 7. | 13.06 ft | on 08-31-1962 |
| 8. | 12.59 ft | on 04-01-1993 |
| 9. | 12.44 ft | on 04-07-1951 |
| 10. | 12.25 ft | on 07-08-1969 |
Historic Crests
| 1. | 18.74 ft | on 06-08-2008 |
| 2. | 15.70 ft | on 03-30-1933 |
| 3. | 14.80 ft | on 03-27-1961 |
| 4. | 14.67 ft | on 05-22-2004 |
| 5. | 14.27 ft | on 04-11-1965 |
| 6. | 14.07 ft | on 09-22-2016 |
| 7. | 13.06 ft | on 08-31-1962 |
| 8. | 12.59 ft | on 04-01-1993 |
| 9. | 12.44 ft | on 04-07-1951 |
| 10. | 12.25 ft | on 07-08-1969 |
| 11. | 12.20 ft | on 06-12-1944 |
| 12. | 12.17 ft | on 09-21-2018 |
| 13. | 11.94 ft | on 06-08-1984 |
| 14. | 11.85 ft | on 06-21-1954 |
| 15. | 11.84 ft | on 07-21-1999 |
| 16. | 11.83 ft | on 04-12-2001 |
| 17. | 11.66 ft | on 05-30-1980 |
| 18. | 11.58 ft | on 05-18-1991 |
| 19. | 11.33 ft | on 08-23-1979 |
| 20. | 11.24 ft | on 02-27-2023 |
| 21. | 11.22 ft | on 02-28-1948 |
| 22. | 11.20 ft | on 03-12-2010 |
| 23. | 10.98 ft | on 06-22-2024 |
| 24. | 10.91 ft | on 04-13-2022 |
| 25. | 10.90 ft | on 06-24-1981 |
| 26. | 10.84 ft | on 04-19-2005 |
| 27. | 10.54 ft | on 03-17-2019 |
| 28. | 10.48 ft | on 04-28-1975 |
| 29. | 10.42 ft | on 03-20-2019 |
| 30. | 10.29 ft | on 06-25-1938 |
| 31. | 10.22 ft | on 03-11-1945 |
| 32. | 9.68 ft | on 03-05-1937 |
| 33. | 9.47 ft | on 03-15-2007 |
| 34. | 9.44 ft | on 05-20-2013 |
| 35. | 9.40 ft | on 03-18-1986 |
| 36. | 9.37 ft | on 03-11-1973 |
| 37. | 9.36 ft | on 06-20-2014 |
| 38. | 9.32 ft | on 03-11-1997 |
| 39. | 9.16 ft | on 06-07-1982 |
| 40. | 9.00 ft | on 03-12-1976 |
| 41. | 8.88 ft | on 03-07-1983 |
| 42. | 8.86 ft | on 07-19-1963 |
| 43. | 8.80 ft | on 06-30-1947 |
| 44. | 8.70 ft | on 03-30-1952 |
| 45. | 8.52 ft | on 02-09-1966 |
| 46. | 8.25 ft | on 03-09-1992 |
| 47. | 8.24 ft | on 04-01-1971 |
| 48. | 8.01 ft | on 06-24-1998 |
| 49. | 7.93 ft | on 03-16-1943 |
| 50. | 7.90 ft | on 03-13-1939 |
| 51. | 7.86 ft | on 08-25-1990 |
| 52. | 7.55 ft | on 03-23-2011 |
| 53. | 7.40 ft | on 03-04-1949 |
| 54. | 7.36 ft | on 06-15-1978 |
| 55. | 7.34 ft | on 03-05-2020 |
| 56. | 7.33 ft | on 05-21-1959 |
| 57. | 7.30 ft | on 03-07-1950 |
| 58. | 7.30 ft | on 06-27-1968 |
| 59. | 7.27 ft | on 10-06-2019 |
| 60. | 7.26 ft | on 07-16-1994 |
| 61. | 7.26 ft | on 03-03-1974 |
| 62. | 7.14 ft | on 02-21-2017 |
| 63. | 7.10 ft | on 06-22-2015 |
| 64. | 7.06 ft | on 04-03-2006 |
| 65. | 6.92 ft | on 08-06-2002 |
| 66. | 6.90 ft | on 03-14-1946 |
| 67. | 6.84 ft | on 05-30-1970 |
| 68. | 6.84 ft | on 05-11-2003 |
| 69. | 6.81 ft | on 06-07-1995 |
| 70. | 6.76 ft | on 06-16-2000 |
| 71. | 6.74 ft | on 02-11-2009 |
| 72. | 6.65 ft | on 09-28-1972 |
| 73. | 6.48 ft | on 03-11-1985 |
| 74. | 6.34 ft | on 03-25-1996 |
| 75. | 6.10 ft | on 03-16-1936 |
| 76. | 6.00 ft | on 06-10-1967 |
| 77. | 5.98 ft | on 03-28-1960 |
| 78. | 5.80 ft | on 03-05-1935 |
| 79. | 5.80 ft | on 11-01-1941 |
| 80. | 5.78 ft | on 08-28-2021 |
| 81. | 5.75 ft | on 06-03-1955 |
| 82. | 5.47 ft | on 05-06-2012 |
| 83. | 5.30 ft | on 03-11-1989 |
| 84. | 4.85 ft | on 09-09-1964 |
| 85. | 4.73 ft | on 08-03-1953 |
| 86. | 4.67 ft | on 04-29-1988 |
| 87. | 4.40 ft | on 06-02-1941 |
| 88. | 4.26 ft | on 05-05-1977 |
| 89. | 4.15 ft | on 04-01-1956 |
| 90. | 4.10 ft | on 04-03-1934 |
| 91. | 3.83 ft | on 06-04-1958 |
| 92. | 3.58 ft | on 05-30-1957 |
| 93. | 3.40 ft | on 03-29-1940 |
Low Water Records
Low Water Records
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1085.01 ft |
| moderate Flooding | 1084.01 ft |
| minor Flooding | 1079.51 ft |
| action | 1077.51 ft |
| Latest Value | 1077.81 ft |
| Gauge Zero | 1069.51 ft |
Gauge Photos
No Images Found
Unique Local Info
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.