Current Stage
138.3 ft
Flood: 146.5 ft • Major: 150.0 ft
Current Flow
1.04 kcfs
6-Hour Trend
Steady
-0.04 ft in 6h
Last Observed
1 hour, 29 minutes ago
Aug 18, 3:30 PM
Hydrograph
The solid line shows recent observed water levels, and the dotted line shows the forecast. Colored horizontal bands mark flood thresholds. Auto-refreshes every 5 min.
Historical Record
Same hydrograph with colored shading behind it showing historical flood categories. This puts the current river level in context with past flood events at this gauge.
Flood Thresholds
Forecast
Forecast Peak
138.42 ft
Expected
Aug 22, 7:00 PM
Category
No_Flooding10-Day River Level Probabilities
Instead of a single forecast line, this chart shows a range of possible river levels over the next 10 days. The shaded bands represent different likelihoods — darker shading means more likely outcomes, lighter shading means less likely but still possible. Colored horizontal lines mark flood thresholds. This helps you see not just what's expected, but how confident the forecast is.
Weekly Chance of Exceeding Levels
Each colored bar represents one week over a 90-day period. The colors show the probability that the river's peak level will exceed a given height during that week — warmer colors mean a higher chance. Read up the vertical axis to find a water level you care about, then check the bar color to see how likely the river is to reach it. This is useful for spotting which weeks carry the most flood risk.
Learn more about this chart →Stage
Flow
Volume
90-Day Chance of Exceeding Levels
These charts compare the current flood outlook to historical averages over the next 90 days. Two lines are shown: a current forecast line and a historical average line. When the current forecast line is above the historical line, the river is more likely than normal to reach higher levels. When it's below, conditions are expected to be calmer than usual. The horizontal axis shows water levels, and the vertical axis shows the percent chance of exceeding them.
Learn more about this chart →Stage
Flow
Volume
Flood Impacts by Stage
150 ft
the Nooksack River will cause major near record flooding downstream through Lynden. Deep and swift flood waters will inundate farm lands...roads...and residential areas. The flood may overtop levees. In addition...flood waters could overflow and flood the Sumas drainage. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Nooksack River Basin.
148 ft
the Nooksack River will cause widespread flooding downstream through Lynden...with swift waters covering some farm lands and roads. Erosion may affect some river banks.
147.3 ft
the Nooksack River cause widespread flooding of low farm lands along the river downstream through Lynden...with swift water moving over several roads.
146.5 ft
the Nooksack River will cause shallow flooding of low pasture lands along the river downstream through Lynden.
Recent Crests
A crest is the highest water level reached during a flood event. These are the most recent recorded peaks at this gauge — useful for comparing current conditions to past floods you may remember.
| Date | Stage (ft) |
|---|---|
|
Dec 11, 2025 8 months, 1 week ago |
150.49 |
|
Jan 28, 2024 2 years, 6 months ago |
147.3 |
|
Dec 5, 2023 2 years, 8 months ago |
146.86 |
|
Nov 5, 2022 3 years, 9 months ago |
146.93 |
|
Nov 28, 2021 4 years, 8 months ago |
147.26 |