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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Big Lost River at Howell Ranch are issued routinely year-round.
Return to Area Map

Downstream Gauge Downstream Gauge - at Mackay Dam
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 4
Action Stage: 3.51
Low Stage (in feet): -9999

Historic Crests
(1) 6.02 ft on 05/25/1967
(2) 6.00 ft on 06/26/1954
(3) 5.94 ft on 06/12/1921
(4) 5.73 ft on 06/12/1965
(5) 5.68 ft on 05/21/2006
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.21 ft on 06/13/2022
(2) 2.82 ft on 06/05/2021
(3) 3.52 ft on 05/31/2020
(4) 4.40 ft on 06/07/2019
(5) 4.15 ft on 05/26/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
4.05 Widespread lowland flooding from Howell Ranch downriver to the top of Mackay Reservoir. Fish Hatchery Road near Donahue Ranch may have water flowing over it. Canals and headgates may have problems.
3.51 Near bankfull from Howell Ranch downriver to the top of Mackay Reservoir. Some lowland flooding of fields possible.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
Historical Peak Flows     (Scroll to Streamflow Statistics for more years)
USGS Historical Peak Flows Explanation
Graphical View of Historical Peak Flows and Gage Analysis 

25   Year Peak Flood 4130 CFS or 5.19 ft
50   Year Peak Flood 4560 CFS or 5.43 ft
100 Year Peak Flood 4960 CFS or 5.64 ft
200 Year Peak Flood 5360 CFS or 5.84 ft
500 Year Peak Flood 5850 CFS
Collaborative Agencies Collapse
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
Pocatello Weather Forecast Office
1945 Beechcraft Ave
Pocatello, ID 83204
(208) 232-9306
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