North Fork Stillaguamish River near Arlington
Critical Stages
10.7' - Action
13' - Flood
14' - Moderate
15' - Major
Latest Observation
Updated: 8:15 AM PST 12/6/25
Status: No Flooding
Stage: 8.12 ft
Flow: 10.4 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 10 AM 12/6 | 7.94 | 10 |
| 4 PM 12/6 | 6.94 | 8 |
| 10 PM 12/6 | 6.21 | 6.65 |
| 4 AM 12/7 | 5.9 | 6.11 |
| 10 AM 12/7 | 5.29 | 5.1 |
| 4 PM 12/7 | 5.16 | 4.89 |
| 10 PM 12/7 | 5.14 | 4.86 |
| 4 AM 12/8 | 5.15 | 4.88 |
| 10 AM 12/8 | 5.68 | 5.74 |
| 4 PM 12/8 | 7.4 | 8.9 |
| 10 PM 12/8 | 9.34 | 13.1 |
| 4 AM 12/9 | 9.77 | 14.1 |
| 10 AM 12/9 | 8.86 | 12 |
| 4 PM 12/9 | 7.67 | 9.45 |
| 10 PM 12/9 | 7.15 | 8.41 |
| 4 AM 12/10 | 7.36 | 8.82 |
| 10 AM 12/10 | 7.96 | 10 |
| 4 PM 12/10 | 8.94 | 12.2 |
| 10 PM 12/10 | 9.19 | 12.8 |
| 4 AM 12/11 | 8.73 | 11.7 |
| 10 AM 12/11 | 8.2 | 10.6 |
| 4 PM 12/11 | 7.78 | 9.67 |
| 10 PM 12/11 | 7.28 | 8.66 |
| 4 AM 12/12 | 6.89 | 7.91 |
| 10 AM 12/12 | 7 | 8.12 |
| 4 PM 12/12 | 7.34 | 8.78 |
| 10 PM 12/12 | 7.74 | 9.59 |
| 4 AM 12/13 | 7.91 | 9.94 |
| 10 AM 12/13 | 7.66 | 9.43 |
| 4 PM 12/13 | 7.49 | 9.08 |
| 10 PM 12/13 | 7.11 | 8.33 |
| 4 AM 12/14 | 6.56 | 7.29 |
| 10 AM 12/14 | 6.07 | 6.41 |
| 4 PM 12/14 | 5.68 | 5.74 |
| 10 PM 12/14 | 5.38 | 5.24 |
| 4 AM 12/15 | 5.23 | 5.01 |
| 10 AM 12/15 | 5.17 | 4.91 |
| 4 PM 12/15 | 5.16 | 4.89 |
| 10 PM 12/15 | 5.15 | 4.88 |
| 4 AM 12/16 | 5.4 | 5.28 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 8:15 AM 12/6 | 8.12 | 10.4 |
| 8:00 AM 12/6 | 8.17 | 10.5 |
| 7:45 AM 12/6 | 8.28 | 10.7 |
| 7:30 AM 12/6 | 8.31 | 10.8 |
| 7:15 AM 12/6 | 8.37 | 10.9 |
| 7:00 AM 12/6 | 8.44 | 11.1 |
| 6:45 AM 12/6 | 8.53 | 11.3 |
| 6:30 AM 12/6 | 8.59 | 11.4 |
| 6:15 AM 12/6 | 8.63 | 11.5 |
| 6:00 AM 12/6 | 8.71 | 11.7 |
| 5:45 AM 12/6 | 8.7 | 11.6 |
| 5:30 AM 12/6 | 8.69 | 11.6 |
| 5:15 AM 12/6 | 8.62 | 11.5 |
| 5:00 AM 12/6 | 8.56 | 11.3 |
| 4:45 AM 12/6 | 8.45 | 11.1 |
| 4:30 AM 12/6 | 8.34 | 10.9 |
| 4:15 AM 12/6 | 8.13 | 10.4 |
| 4:00 AM 12/6 | 7.94 | 10 |
| 3:45 AM 12/6 | 7.71 | 9.53 |
| 3:30 AM 12/6 | 7.56 | 9.22 |
| 3:15 AM 12/6 | 7.35 | 8.8 |
| 3:00 AM 12/6 | 7.1 | 8.31 |
| 2:45 AM 12/6 | 6.88 | 7.89 |
| 2:30 AM 12/6 | 6.64 | 7.44 |
| 2:15 AM 12/6 | 6.36 | 6.92 |
| 2:00 AM 12/6 | 6.09 | 6.44 |
| 1:45 AM 12/6 | 5.8 | 5.94 |
| 1:30 AM 12/6 | 5.51 | 5.46 |
| 1:15 AM 12/6 | 5.3 | 5.12 |
| 1:00 AM 12/6 | 5.08 | 4.75 |
15' -
the North Fork Stillaguamish River will cause extensive flooding from near Darrington downstream to the confluence with the South Fork Stillaguamish River...including Oso...Cicero...Swede Heaven and SR 530. Flood waters will also cause riverbank erosion. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the N Fork Stillaguamish River Basin. A stage of 15 feet corresponds to Phase 4 in the Snohomish County Flood Warning System.
14' -
the North Fork Stillaguamish River will cause flooding in the Cicero and Swede Heaven areas...Oso Loop Road...and SR 530. Flood waters will also cause riverbank erosion. A stage of 14 feet corresponds to Phase 3 in the Snohomish County Flood Warning System.
13' -
the North Fork Stillaguamish River will cause flooding of Oso Loop Road and cause minor riverbank erosion. A stage of 13 feet corresponds to Phase 2 in the Snohomish County Flood Warning System.
| Date | Stage (ft) |
|---|---|
| Dec 12, 2010 | 15.59 |
| Dec 5, 2023 | 15.21 |
| Dec 5, 2023 | 15.21 |
| Nov 24, 1990 | 15.2 |
| Jan 8, 2009 | 15.12 |
| Nov 17, 2015 | 15.07 |
| Feb 8, 1996 | 14.84 |
| Mar 19, 1997 | 14.81 |
| Oct 21, 2003 | 14.81 |
| Nov 13, 2015 | 14.79 |
| Nov 9, 1990 | 14.75 |
| Nov 29, 1995 | 14.66 |
| Feb 22, 2002 | 14.62 |
| Feb 1, 2020 | 14.57 |
| Nov 6, 2006 | 14.51 |
| Nov 22, 2017 | 14.51 |
| Nov 25, 2004 | 14.5 |
| Feb 19, 1995 | 14.38 |
| Dec 5, 1989 | 14.32 |
| Nov 30, 1994 | 14.1 |
Data provided by the National Weather Service.
