CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

MIDDLE FORK FEATHER RIVER - PORTOLA (MFTC1)

Latitude: 39.82º N	Longitude: 120.44º W	Elevation: 4850 Feet
Location: Plumas County in California		Bulletin Group: Lower Sacramento		River Group: Feather Yuba

Issuance Time:

Dec 09 2023 at 8:36 AM PST

Next Issuance:

Dec 10 2023 at 9:00 AM PST

Monitor Stage: 4851.0 Feet

Flood Stage: 4852.5 Feet

Plot Type:

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View CA DWR Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022*	903	4848.74	Jan 9, 2022
2021*	153	4846.62	Feb 14, 2021
2020*	403	4847.60	Apr 9, 2020
2019*	5,650	9.50	Mar 1, 2019
2018*	6,110	9.76	Mar 23, 2018
Historical High Stage/Flow Events (Period of Record - Oct 1968 to 1980 and 2007 to Present) - Ranked by Flow
2017*	12,700	12.61	Feb 10, 2017
1969*	7,640	10.18**	Jan 21, 1969
1971*	6,580	9.64**	Mar 27, 1971
1980*	5,690	9.42**	Jan 14, 1980
2019*	5,650	9.50	Mar 1, 2019
1970*	4,970	8.81**	Jan 25, 1970
2011*	4,851	9.03	Mar 17, 2011
* Discharge affected to unknown degree by regulation or diversion
** Peak stage and flow courtesy of USGS.
*** Datum changed from Local to NAVD88 on 10/01/2019. The difference is +4843.6 ft and must be applied to all data before date to convert to NAVD88

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Impacts - E19 Information
4851.0 Feet	Monitor Stage. Some areas of very minor out of bank flow between Beckwourth and Clio.
4852.0 Feet	Limited minor lowland flooding between Beckwourth and Clio. Potential for road impacts near Clio with large contribution from tributary creeks.
4852.5 Feet	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.
4853.0 Feet	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.
4853.5 Feet	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.
4854.0 Feet	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 1/9/2017.
4854.5 Feet	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.
4855.5 Feet	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.
4856.5 Feet	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.

Official 7 Day National Weather Service Forecast (CAZ071)

Today: Mostly cloudy. Highs 43 to 53. Light winds.

Tonight: Mostly cloudy in the evening then clearing. Lows 21 to 31. Light winds.

Monday: Partly cloudy. Highs 47 to 52. Light winds.

Monday Night: Clear. Lows 19 to 29. Northeast winds around 10 mph in the evening becoming light.

Tuesday: Partly cloudy in the morning then becoming sunny. Highs 38 to 48. East winds 10 to 15 mph.

Tuesday Night: Clear. Lows 16 to 26.

Wednesday: Partly cloudy. Highs 39 to 49.

Wednesday Night through Friday Night: Mostly cloudy. Lows 18 to 28. Highs 40 to 50.

Saturday: Partly cloudy. Highs 47 to 52.

Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS Reno Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.

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