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South Loup River in Nebraska

River40.4 mi
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Around South Loup River

5 mi

Public land: USGS PAD-US

About this river

South Loup River is a 40.4 mile river. Streamflow is measured at the USGS gauge South Loup River at Arnold, Nebr (site 06781600). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.

Typical flow by month

2010 to 2026

South Loup River typically runs highest in March, at a median 42 cfs, and lowest in September, at 19 cfs. The highest flow on record for any single day is 788 cfs, in 2019.

Show the numbers
Typical flow by month at South Loup River at Arnold, Nebr., in cfs
MonthTypical (cfs)Usual range (cfs)
January2924 to 36
February3731 to 43
March4234 to 61
April3830 to 48
May4130 to 55
June3424 to 48
July2518 to 34
August2216 to 26
September1915 to 24
October2520 to 29
November2824 to 32
December3024 to 34

Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 16 years of record. Statistics published by the US Geological Survey for South Loup River at Arnold, Nebr. (site 06781600). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.

Boat access nearby

One mapped launch sits in the mapped area of South Loup River. Ramp data comes from the USGS national boat-ramp inventory.

  • Arnold LakeArnold LakePublic

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