Search
Menu

Explore

Hazards

Analysis

Rankings

Reference

Falls Creek near Petersburg

Highest listed crest 24.48 ftFlood stage 22.5 ft9 crests since 2017

The Falls Creek near Petersburg crested above flood stage 6 times among the 9 crests the National Weather Service lists from 2017 to 2023. The highest, 24.48 ft on December 1, 2020, was moderate flooding, 1.98 feet above flood stage.

The gauge

Highest listed crest
24.48 ft
December 1, 2020
Flood stage
22.5 ft
Major flooding from 27.0 ft
Crests at major
0
6 above flood stage
Most recent flood crest
September 22, 2023
23.84 ft, minor flooding
Location
Petersburg Borough
Alaska
Identifiers
NWS FLSA2
No USGS station

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Falls Creek near Petersburg
Action stage21.53Sep 30, 2022The level at which the NWS or its partners begin to take action
Flood stage (minor)22.55Sep 22, 2023Minimal or no property damage, but possibly some public threat
Moderate flood stage24.01Dec 1, 2020Some inundation of structures and roads near the stream
Major flood stage27.00—Extensive inundation of structures and roads

Every listed crest

9 crests from 2017 to 2023. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Falls Creek near Petersburg, 2017 to 2023 2022242628ft Flood stage 22.5 ftMajor 27.0 ft Sep 26, 2017: 23.61 ft, minor floodingDec 14, 2017: 21.62 ft, action stageSep 20, 2019: 22.71 ft, minor floodingNov 1, 2020: 23.71 ft, minor floodingDec 1, 2020: 24.48 ft, moderate floodingOct 1, 2021: 22.39 ft, action stageSep 30, 2022: 22.39 ft, action stageAug 12, 2023: 23.41 ft, minor floodingSep 22, 2023: 23.84 ft, minor flooding Highest, 24.48 ft, Dec 1, 2020 20202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Falls Creek near Petersburg 2010s: 2 2020s: 4 4 2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.
  3. 3 crests measured on an earlier gauge datum are left out: 22.79 ft on Sep 21, 2004; 22.84 ft on Sep 25, 2006; 22.00 ft on Dec 6, 2006.

Highest crests

Highest listed crests, Falls Creek near Petersburg
1Dec 1, 202024.48+1.98Moderate—
2Sep 22, 202323.84+1.34Minor—
3Nov 1, 202023.71+1.21Minor—
4Sep 26, 201723.61+1.11Minor—
5Aug 12, 202323.41+0.91Minor—
6Sep 20, 201922.71+0.21Minor—
7Oct 1, 202122.39−0.11Action—
8Sep 30, 202222.39−0.11Action—
9Dec 14, 201721.62−0.88Action—

Petersburg Borough: every hazard · River floods across the country · Alaska

NOAA National Water Prediction Service, gauge FLSA2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.