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South Branch Onancock Creek at Onancock

Highest listed crest 6.40 ftFlood stage 4.5 ft16 crests since 2012

The South Branch Onancock Creek at Onancock crested above flood stage 10 times among the 16 crests the National Weather Service lists from 2012 to 2026. The highest, 6.40 ft on December 18, 2023, was moderate flooding, 1.90 feet above flood stage.

The gauge

Highest listed crest
6.40 ft
December 18, 2023
Flood stage
4.5 ft
Major flooding from 6.5 ft
Crests at major
0
10 above flood stage
Most recent flood crest
September 27, 2026
4.90 ft, minor flooding
Location
Accomack County
Virginia
Identifiers
NWS ONAV2
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, South Branch Onancock Creek at Onancock
Action stage4.03May 11, 2024The level at which the NWS or its partners begin to take action
Flood stage (minor)4.57Sep 27, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage5.53Dec 18, 2023Some inundation of structures and roads near the stream
Major flood stage6.50—Extensive inundation of structures and roads

Every listed crest

16 crests from 2012 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the South Branch Onancock Creek at Onancock, 2012 to 2026 34567ft Flood stage 4.5 ftMajor 6.5 ft Oct 29, 2012: 6.30 ft, moderate floodingNov 22, 2023: 5.90 ft, moderate floodingNov 26, 2023: 5.40 ft, minor floodingDec 11, 2023: 5.00 ft, minor floodingDec 18, 2023: 6.40 ft, moderate floodingDec 28, 2023: 3.30 ft, below flood stageFeb 6, 2024: 3.90 ft, below flood stageFeb 13, 2024: 4.30 ft, action stageMar 9, 2024: 4.73 ft, minor floodingMar 27, 2024: 4.09 ft, action stageMay 11, 2024: 4.20 ft, action stageMay 28, 2024: 3.57 ft, below flood stageSep 22, 2024: 4.56 ft, minor floodingOct 12, 2025: 4.78 ft, minor floodingOct 30, 2025: 4.64 ft, minor floodingSep 27, 2026: 4.90 ft, minor flooding Highest, 6.40 ft, Dec 18, 2023 201520202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, South Branch Onancock Creek at Onancock 2010s: 1 2020s: 9 9 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.

Highest crests

Highest listed crests, South Branch Onancock Creek at Onancock
1Dec 18, 20236.40+1.90Moderate—
2Oct 29, 20126.30+1.80Moderate—
3Nov 22, 20235.90+1.40Moderate—
4Nov 26, 20235.40+0.90Minor—
5Dec 11, 20235.00+0.50Minor—
6Sep 27, 20264.90+0.40Minor—
7Oct 12, 20254.78+0.28Minor—
8Mar 9, 20244.73+0.23Minor—
9Oct 30, 20254.64+0.14Minor—
10Sep 22, 20244.56+0.06Minor—
11Feb 13, 20244.30−0.20Action—
12May 11, 20244.20−0.30Action—
13Mar 27, 20244.09−0.41Action—
14Feb 6, 20243.90−0.60Below flood stage—
15May 28, 20243.57−0.93Below flood stage—
16Dec 28, 20233.30−1.20Below flood stage—

Other gauges in Accomack County

Flood gauges in Accomack County
Atlantic Coast at Wachapreague (IN MLLW)6.59.52 ft, Sep 1, 200613
Chesapeake Bay at Port Isobel/Tangier Island (IN MLLW)3.34.55 ft, Oct 12, 20253
Chesapeake Bay near Pungoteague Creek at Harborton (IN MLLW)4.56.40 ft, Dec 18, 20230
Chesapeake Bay near Starling Creek at Saxis (IN MLLW)4.55.81 ft, Dec 23, 20220
Chincoteague Bay Inlet (IN MLLW)4.55.84 ft, Jan 23, 20160

Accomack County: every hazard · River floods across the country · Virginia

NOAA National Water Prediction Service, gauge ONAV2, 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.