Residents in parts of northwest Alaska should stay alert as heavy rainfall continues to raise water levels in rivers and streams. A Flood Watch is in effect through noon Friday for the South Slopes of the Western Brooks Range and Upper Kobuk Valleys, including communities such as Walker Lake, Ambler, Shungnak, and Kobuk.
Which Rivers Are at Risk?
The Koyukuk River near Alatna is expected to crest by late Wednesday, while the Kobuk River is already rising quickly in the town of Kobuk. These rivers, along with nearby creeks and streams, are approaching or exceeding normal levels due to days of steady rainfall.
Ongoing Rainfall Making Things Worse
The ground is already saturated from earlier rain, meaning any additional showers will quickly run off into rivers and creeks, rather than soaking into the soil. This raises the chance of:
Stream and river flooding
Flash floods, especially in low-lying areas or those with poor drainage
Breached stream banks
Even moderate rainfall is now enough to cause high water flows and potential flooding.
What Residents Should Do Now
If you live near a river, creek, or stream in the affected area, it’s important to take precautions. Here’s what you should do:
Stay updated with local weather reports and alerts
Prepare emergency supplies, especially if you’re in a flood-prone area
Have a plan for evacuation or moving to higher ground if needed
Avoid walking or driving through flooded areas
Watch for signs of rising water, especially during the night
Timeline of Flood Risk
| Day | Expected Conditions | Flood Risk Level |
|---|---|---|
| Wednesday (PM) | Koyukuk River near crest; Kobuk River still rising | High |
| Thursday | Continued rain possible; saturated ground | High |
| Friday (AM) | Flood Watch remains in effect; possible new alerts issued | Moderate to High |
The situation is fluid, and new flood watches or warnings may be issued over the next couple of days, depending on how much more rain falls and how fast the rivers respond.
Communities Under Watch
Residents in the following areas should pay extra attention:
Walker Lake
Ambler
Shungnak
Kobuk
Alatna and surrounding parts of the Koyukuk River valley
Local emergency officials and the National Weather Service are monitoring the situation closely.
Heavy rain and already saturated ground are creating dangerous flood conditions in parts of northwest Alaska, particularly near the Kobuk and Koyukuk Rivers. The Flood Watch remains in effect through Friday morning, and flooding could develop with little warning. Stay informed, have a plan, and take action early if you live in a flood-prone area.
