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  NOTICE:There is a service interruption for a number of stream gauges nationwide due to the Global Positioning System (GPS) Rollover that occurred on April 6 at 23:59 GMT. The National Weather Service is working with federal, state, and local partners to ensure those affected gauges obtain the necessary updates to resume data transmission. We apologize for the service interruption and hope to have the data restored as soon as possible.

Hydrograph River at a Glance Download
Snake Creek near Ashton Stage (ft)Observed: 12.1 ft at 7:00AM Apr 13, 2019Observed: 11.85 ft at 5:15PM Apr 13, 2019Observed: 11.65 ft at 9:30AM Apr 14, 2019Observed: 11.65 ft at 4:45PM Apr 14, 2019Observed: 12 ft at 7:15AM Apr 15, 2019Observed: 12.7 ft at 7:10AM Apr 16, 2019Observed: 13 ft at 3:00PM Apr 16, 2019Observed: 13.45 ft at 9:00AM Apr 17, 2019Observed: 13.6 ft at 3:16PM Apr 17, 2019Highest Observation: 14.1 ft at 7:10AM Apr 18, 2019Forecast: 14.5 ft 1:00PM Apr 18, 2019Forecast: 15.1 ft 7:00PM Apr 18, 2019Forecast: 15.8 ft 1:00AM Apr 19, 2019Forecast: 16.5 ft 7:00AM Apr 19, 2019Forecast: 17.3 ft 1:00PM Apr 19, 2019Forecast: 17.7 ft 7:00PM Apr 19, 2019Highest Forecast: 17.9 ft 1:00AM Apr 20, 2019Forecast: 17.8 ft 7:00AM Apr 20, 2019Forecast: 17.7 ft 1:00PM Apr 20, 2019Forecast: 17.5 ft 7:00PM Apr 20, 2019Forecast: 17.3 ft 1:00AM Apr 21, 2019Forecast: 17 ft 7:00AM Apr 21, 2019SNKS2(plotting HGIRZ) Graph Created (12:00PM Apr 18, 2019)ObservedForecast (issued 9:44AM Apr 18)Latest observed value: 14.1 ft at 7:10 AM CDT 18-Apr-2019. Flood Stage is 11.5 ft
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Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Graphical forecasts are not available for the Snake Creek near Ashton. During times of high water, forecast crest information can be found in the text products.
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Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 13
Flood Stage: 11.5
Action Stage: 9.5
Low Stage (in feet): -9999

Historic Crests
(1) 20.74 ft on 04/01/1997
(2) 19.79 ft on 03/20/2010
(3) 17.45 ft on 03/24/2011
(4) 17.21 ft on 04/10/1969
(5) 16.20 ft on 03/31/1978
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(P): Preliminary values subject to further review.

Recent Crests
(1) 17.45 ft on 03/24/2011
(2) 19.79 ft on 03/20/2010
(3) 20.74 ft on 04/01/1997
(4) 12.87 ft on 03/30/1989
(5) 5.21 ft on 04/03/1987
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(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:14
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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If you notice any errors in the below information, please contact our Webmaster
21 The Highway 281 bridge at the gauge and the bridge 2 miles west of Ashton are both overtopped
19 The water reaches the bottom of the Highway 281 bridge at the gauge
18 The water reaches the bottom of the bridge 2 miles west of Ashton
15.5 The bridges 1 mile east and 1 mile northwest of the gauge are both overtopped
13 The water reaches the bottom of the bridge 1 mile east of the gauge and the bridge 1 mile northwest of the gauge
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Latitude: 44.959167° N, Longitude: 98.515278° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 11.5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

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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
Aberdeen Weather Forecast Office
824 Brown County 14 South
Aberdeen, SD 57401
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Page last modified: 1-Mar-2019 12:34 AM
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