NWSR extends flood, snowmelt advisories for Middle Fork Popo Agie River

    (Fremont County, WY) – The National Weather Service in Riverton has extended the flood advisory issued for the Middle Fork Popo Agie River yesterday, to until 5:00 PM today, June 7.

    The advisory was originally set to expire at 7:00 AM this morning.

    Elevated river levels are forecasted for the Little Wind River Basin, including Sinks Canyon.


    Additionally, the NWSR extended the snowmelt flood advisory issued yesterday that was set to expire this morning as well, but this time “until further notice.”

    At 3:15 AM this morning the stage was 5.8 feet, the NWSR reports, up slightly from yesterday.

    5.5 feet is once again listed as the bankfull and action stages, with the flood stage at 6.5 feet.

    The NWS defines the stages as follows:

    • Bankfull Stage – an established gage height at a given location along a river or stream, above which a rise in water surface will cause the river or stream to overflow the lowest natural stream bank somewhere in the corresponding reach. The term “lowest bank” is however, not intended to apply to an unusually low place or a break in the natural bank through which the water inundates a small area. Bankfull stages on streams with natural or manmade high banks can be defined by the predominant vegetation line on the banks. The bankfull stage on many streams is associated with the 2-year recurrence interval flood. Bankfull stage is not necessarily the same as flood stage.
    • Action Stage – the stage which, when reached by a rising stream, represents the level where the NWS or a partner/user needs to take some type of mitigation action in preparation for possible significant hydrologic activity. The type of action taken varies for each gage location. Gage data should be closely monitored by any affected people if the stage is above action stage.
    • Flood Stage – an established gage height for a given location above which a rise in water surface level begins to create a hazard to lives, property, or commerce. The issuance of flood advisories or warnings is linked to flood stage. Not necessarily the same as bankfull stage.

    Caution is urged when walking near riverbanks. Additional information and updates are available at

    h/t NWSR

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