Rivermatics

USGS Streamgage 06307830

Tongue River below Brandenberg bridge near Ashland, MT

Tongue River below Brandenberg bridge near Ashland, MT is USGS streamgage 06307830 in Montana, monitoring river discharge in hydrologic subbasin 10090102. It sits on the Tongue River, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,882 square miles. Discharge records at this site go back to 1973. Typical flow runs near 462.7 cfs in July and 247.3 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Montana
Drainage area
3,882 sq mi
Gauge elevation
2,749 ft
Subbasin (HUC-8)
10090102
Coordinates
45.84039, -106.22343
USGS site number
06307830
Records begin
1973-10-01 (53 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Tongue River below Brandenberg bridge near Ashland, MT. 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.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
137 143 147
133 142 146
129 141 147
128 140 149
125 139 149
122 138 150
120 139 153
118 138 154
115 137 154
113 136 154
112 135 155
109 134 155
107 133 155
105 132 155

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 53 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 94.7 157.9 296.8
February 96.2 165.8 329.9
March 101.4 203.1 548.5
April 105.9 247.3 637.5
May 159.1 561.3 1,740.2
June 206.9 1,246.5 3,066.7
July 222.9 462.7 1,176.1
August 171.8 359.4 520.9
September 117.8 300.3 441.7
October 108.2 240.9 428.9
November 100.5 199.7 371.1
December 95.7 168 290.8

All values in cubic feet per second (cfs).

Common questions

When does Tongue River below Brandenberg bridge near Ashland, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 1,246.5 cfs, against 157.9 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Tongue River below Brandenberg bridge near Ashland, MT?
It depends on the month. In January, half of days historically fall near 157.9 cfs, with the middle 80% of days between 94.7 and 296.8 cfs. The month-by-month table on this page gives the full range.
How long has Tongue River below Brandenberg bridge near Ashland, MT been measured?
Discharge records at USGS site 06307830 begin in 1973, about 53 years, covering roughly 6,971 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Tongue River below Brandenberg bridge near Ashland, MT?
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. A companion model forecasts each day's water-temperature high and low. 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 Tongue River below Brandenberg bridge near Ashland, MT?
The gauge sits at 45.84039, -106.22343, in Montana, in hydrologic subbasin 10090102, at an elevation of about 2,749 feet, draining roughly 3,882 square miles.
Can I use Tongue River below Brandenberg bridge near Ashland, MT 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 Tongue River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Tongue River in full.

Other gauges in this subbasin