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This probabilistic forecast is issued by the California Nevada River Forecast Center.
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About this graph
Forecasts for the Middle Fork Feather River near Portola are issued routinely year-round.
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Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 4855.5
Moderate Flood Stage: 4853.5
Flood Stage: 4852.5
Action Stage: 4851
Low Stage (in feet): -9999

Historic Crests
(1) 4,856.27 ft on 02/11/2017 (P)
(2) 4,854.42 ft on 03/16/2023 (P)
(3) 4,854.11 ft on 01/21/1969 (P)
(4) 4,853.58 ft on 03/27/1971 (P)
(5) 4,853.55 ft on 01/10/2017 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 4,854.42 ft on 03/16/2023 (P)
(2) 4,853.06 ft on 03/01/2019 (P)
(3) 4,853.06 ft on 02/28/2019 (P)
(4) 4,853.32 ft on 03/24/2018 (P)
(5) 4,856.27 ft on 02/11/2017 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4,845.02 ft on 09/24/1976
(2) 4,845.02 ft on 10/01/1977
(3) 4,845.02 ft on 09/11/1969
(4) 4,845.03 ft on 09/15/1978
(5) 4,845.08 ft on 08/08/1973
Show More Low Water Records
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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
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4856.5 Major to near record flooding. Major damages to transportation, homes and businesses. Similar to January 1997, and in excess of February 9, 2017. Potential for rapid rises and major impacts from tributary streams. Tributary impacts may significantly proceed main-stem peak flows.
4855.5 Major Flood Stage. Major disruptions to transportation with significant impacts to homes and businesses between Beckworth and Clio. Approaching levels of February 9, 2017. Potential for rapid rises and major impacts from tributary streams. Impacts below Portola influenced by magnitude of tributary flows, especially Sulphur Creek. Tributary impacts may significantly proceed main-stem peak flows.
4854.5 Moderate flooding of businesses, homes, structures, and roads, including Highway 89 near Clio, portions of Highway 70, and low lying homes from Beckwourth to Clio. Impacts below Portola influenced by magnitude of tributary flows, especially Sulphur Creek.
4854 Moderate flooding of lowlands, roads, homes, businesses and structures along river from Beckwourth to Clio. Lowest homes on West Street begin to flood. Impacts below Portola influenced by magnitude of tributary flows, especially Sulphur Creek. Similar level to February 22nd, 2017, and slightly exceeding flooding of January 9, 2017.
4853.5 Moderate Flood Stage. Flooding of lowlands, structures, and roads from Beckwourth to Clio. Several low lying structures along river in Portola flood. Evacuation of homes on south end of West Street may be necessary. Highway 89 near Clio likely flooded. Impacts below Portola influenced by magnitude of tributary flows, especially Sulphur Creek. Similar level to 1/9/2017.
4853 Minor flooding of lowlands, roads, and low-lying structures between Beckwourth to Clio. In Portola the lowest lying buildings and businesses on highway 70 may begin to experience some minor flooding. Water along West Street nearing lowest homes along river. Highway 89 near Clio likely flooded. Potential for greater impacts in the lower portion of the reach with large contribution from tributary creeks. Similar level to 3/23/2018.
4852.5 Flood stage. Minor flooding of lowlands, rural roads, agricultural areas, and some low structures between Beckwourth and Clio. In Portola, water nearing lowest lying businesses along Highway 70 on west edge of Portola. The south end of West Street in Portola floods. Portions of Highway 89 near Clio may begin to flood. Potential for greater impacts in the lower portion of the reach with large contribution from tributary creeks. Similar level to March 17, 2011.
4852 Limited minor lowland flooding between Beckwourth and Clio. Potential for road impacts near Clio with large contribution from tributary creeks.
4851 Monitor Stage. Some areas of very minor out of bank flow between Beckwourth and Clio.
Photos
(1) Upstream View From Gage Location above Portola on 17 March 2011.
(2) Downstream View from Gage Location Above Portola on 17 March 2011 with a Stage of 9.0 Feet.
(3) Upstream View from West Street on the Left Bank in Portola on 17 March 2011 at 9.0 Feet.
(4) Upstream View From CA Hwy 89 below Clio Bridge on 17 March 2011.

Other Real-time and/or Archive Data Sources:

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.
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Page last modified: 30-Oct-2020 4:07 PM
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