USGS Streamgage 06921590
South Grand River at Archie, MO
South Grand River at Archie, MO is USGS streamgage 06921590 in Missouri, monitoring river discharge in hydrologic subbasin 10290108. It sits on the South Grand River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 356 square miles. Discharge records at this site go back to 1969. Typical flow runs near 19.9 cfs in July and 140.6 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Missouri
- Drainage area
- 356 sq mi
- Gauge elevation
- 805 ft
- Subbasin (HUC-8)
- 10290108
- Coordinates
- 38.49158, -94.34424
- USGS site number
- 06921590
- Records begin
- 1969-10-01 (57 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for South Grand River at Archie, MO. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 28.5 | 50.1 | 112 | ||
| 15.6 | 27.2 | 68 | ||
| 11.4 | 20.4 | 96 | ||
| 11.5 | 29.4 | 319 | ||
| 10.7 | 28.2 | 172 | ||
| 9.7 | 22.9 | 156 | ||
| 8.8 | 19.7 | 125 | ||
| 8.2 | 19.4 | 185 | ||
| 8.1 | 20 | 116 | ||
| 7.6 | 16.9 | 61.1 | ||
| 6.8 | 13.8 | 35.3 | ||
| 6.3 | 12.3 | 30.3 | ||
| 5 | 10 | 32.3 | ||
| 4.3 | 8.6 | 23.2 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 57 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 4.9 | 43.9 | 509.5 | |
| February | 10.2 | 75.8 | 557.3 | |
| March | 20.4 | 129.4 | 1,264.4 | |
| April | 24.2 | 140.6 | 1,313.8 | |
| May | 20.5 | 130.3 | 1,850.2 | |
| June | 9.8 | 66.9 | 1,619.1 | |
| July | 1.1 | 19.9 | 512.2 | |
| August | 0.3 | 9.3 | 135.1 | |
| September | 0.4 | 8.4 | 480.6 | |
| October | 0.9 | 11.8 | 625.9 | |
| November | 3 | 29 | 353.4 | |
| December | 4 | 36.4 | 379.7 |
All values in cubic feet per second (cfs).
Common questions
- When does South Grand River at Archie, MO normally run highest?
- April, on the long-term record. The median daily flow that month is about 140.6 cfs, against 8.4 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for South Grand River at Archie, MO?
- It depends on the month. In January, half of days historically fall near 43.9 cfs, with the middle 80% of days between 4.9 and 509.5 cfs. The month-by-month table on this page gives the full range.
- How long has South Grand River at Archie, MO been measured?
- Discharge records at USGS site 06921590 begin in 1969, about 57 years, covering roughly 7,006 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for South Grand River at Archie, MO?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is South Grand River at Archie, MO?
- The gauge sits at 38.49158, -94.34424, in Missouri, in hydrologic subbasin 10290108, at an elevation of about 805 feet, draining roughly 356 square miles.
- Can I use South Grand River at Archie, MO data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Upstream and downstream on the South Grand River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the South Grand River in full.
- South Grand River at Archie, MO this page
- South Grand River at Urich, MO 670 sq mi