Near Harrison Mills 08MG001
Reading the latest value from Water Survey of Canada…
Shaded band: the middle half of the month's daily means in the agency's archive.
Live readings are provisional: the agency publishes them before checking them and can revise them. CanoeMap shows the agency's numbers as published. See this gauge at the agency
Typical level and flow by month
Near Harrison Mills 08MG001
Flow is typically highest in May (47.8 m³/s) and lowest in August (6.62 m³/s). Level is typically highest in November (9.61 m) and lowest in September (8.79 m).
| Month | Typical flow (m³/s) | Middle half of days | Typical level (m) | Middle half of days |
|---|---|---|---|---|
| January | 34.2 | 19.7 – 64.9 | 9.49 | 9.20 – 9.84 |
| February | 24.0 | 15.0 – 37.6 | 9.33 | 9.14 – 9.57 |
| March | 28.0 | 18.4 – 46.3 | 9.37 | 9.18 – 9.61 |
| April | 37.6 | 26.8 – 54.2 | 9.53 | 9.33 – 9.74 |
| May | 47.8 | 33.9 – 63.9 | 9.60 | 9.45 – 9.76 |
| June | 36.9 | 23.1 – 52.2 | 9.40 | 9.24 – 9.57 |
| July | 14.8 | 9.92 – 25.1 | 9.05 | 8.94 – 9.17 |
| August | 6.62 | 4.73 – 11.4 | 8.82 | 8.78 – 8.88 |
| September | 7.81 | 4.43 – 15.6 | 8.79 | 8.75 – 9.04 |
| October | 22.1 | 8.96 – 52.6 | 9.23 | 8.95 – 9.72 |
| November | 42.0 | 22.7 – 77.5 | 9.61 | 9.28 – 9.91 |
| December | 29.6 | 18.0 – 54.1 | 9.45 | 9.22 – 9.77 |
Flow: median of daily means, 29 complete years from 1996 to 2025. Level: median of daily means, 10 complete years from 2016 to 2025.
When does the spring peak come?
Computed from the agency's published daily means: for each year, the highest day between March 1 and July 31.
Near Harrison Mills (08MG001): over 29 complete years from 1996 to 2025, the highest daily flow between March and July came around April 13 (the median date). In 15 of those 29 years it came between March 18 and May 18. The median peak was 139 m³/s; the highest in the period, 454 m³/s, came on March 12, 2007.
About the gauges
Near Harrison Mills
- Station number
- 08MG001
- Official name
- CHEHALIS RIVER NEAR HARRISON MILLS
- Agency
- Water Survey of Canada
- Drainage area
- 382 km²
- Level datum
- ASSUMED DATUM
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Questions
What is the Chehalis River water level today?
The reading at the top of this page comes from Water Survey of Canada each time the page loads, for gauge 08MG001 (Near Harrison Mills). The table of typical values shows whether the reading is high or low for the season.
When does the Chehalis River peak in spring?
Near Harrison Mills (08MG001): over 29 complete years from 1996 to 2025, the highest daily flow between March and July came around April 13 (the median date). In 15 of those 29 years it came between March 18 and May 18. The median peak was 139 m³/s; the highest in the period, 454 m³/s, came on March 12, 2007.
Data source: Environment and Climate Change Canada (real-time readings and the HYDAT archive), end-use licence. CanoeMap computes the typical values and the peak dates from those archives.