USGS · 06356500

SOUTH FORK GRAND RIVER

USGS · 06356500LIVE

South Fork Grand R nr Cash, SD

PERKINS COUNTY, SD45.6491°N, -102.6433°W Updated 15 hr ago

FLOW RATE

13cfs

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

13cfs 1.5% vs avg

Optimal band: 15–21 cfs

PERIOD HIGH

215cfs

PERIOD LOW

7cfs

RUNNABLE

33%

last 1 year in band

Precipitation History

Precipitation · YTD

Dry

Drier than normal

2026 to date

9.4in

-18% vs normal

9.45 in of precipitation so far this year, 18% below the 30-year normal of 11.5 in for this point in the season.

YTD Total

9.4in

This year so far

Normal to Date

11.5in

30-yr average

Typical Range

8.0–15.3in

10th–90th pct YTD

Departure

-18%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 0.63" · normal 0.52" (0.2–0.9)

Jan

Feb: 0.16" · normal 0.70" (0.3–1.3)

Feb

Mar: 0.81" · normal 1.14" (0.5–1.6)

Mar

Apr: 2.29" · normal 2.18" (1.0–3.3)

Apr

May: 3.03" · normal 3.08" (1.4–5.4)

May

Jun: 2.30" · normal 3.15" (1.4–5.0)

Jun

Jul: 0.23" (so far)· normal 2.17" (0.8–3.2)

Jul

Aug: normal 1.73" (0.7–3.6)

Aug

Sep: normal 1.47" (0.5–2.7)

Sep

Oct: normal 1.72" (0.5–3.1)

Oct

Nov: normal 0.69" (0.1–1.3)

Nov

Dec: normal 0.58" (0.1–1.1)

Dec

Baseline 1991–2020 · Source: Open-Meteo10:54 AM

Your History · South Fork Grand R nr Cash, SD

Track your history

Station Location

45.6491, -102.6433

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DATA · USGS · NOAA · NWSUPDATED 2026-07-07 00:00 UTC

Site #06356500·USGS

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