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North Fork Big Lost River at Wild Horse

Highest listed crest 6.41 ftFlood stage 5.1 ft30 crests since 1956

The North Fork Big Lost River at Wild Horse crested above flood stage 15 times among the 30 crests the National Weather Service lists from 1956 to 2024. The highest, 6.41 ft on May 21, 2006, was minor flooding, 1.30 feet above flood stage.

The gauge

Highest listed crest
6.41 ft
May 21, 2006; 2,170 cubic feet per second
Flood stage
5.1 ft
No major stage set
Crests at major
0
15 above flood stage
Most recent flood crest
December 13, 2024
5.46 ft, minor flooding
Location
Custer County
Idaho

Flood stages

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

Flood categories, North Fork Big Lost River at Wild Horse
Action stage4.81Jun 7, 2019The level at which the NWS or its partners begin to take action
Flood stage (minor)5.115Dec 13, 2024Minimal or no property damage, but possibly some public threat

Every listed crest

30 crests from 1956 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the North Fork Big Lost River at Wild Horse, 1956 to 2024 34567ft Flood stage 5.1 ft May 24, 1956: 6.18 ft, minor flooding; 1,270 cubic feet per secondMay 22, 1958: 5.84 ft, minor flooding; 1,200 cubic feet per secondJun 12, 1965: 6.39 ft, minor flooding; 1,420 cubic feet per secondMay 25, 1967: 6.23 ft, minor flooding; 1,380 cubic feet per secondJun 17, 1974: 5.92 ft, minor flooding; 1,300 cubic feet per secondMay 30, 1983: 5.78 ft, minor flooding; 1,180 cubic feet per secondMay 30, 1986: 5.85 ft, minor flooding; 1,440 cubic feet per secondJun 5, 1995: 5.59 ft, minor flooding; 1,390 cubic feet per secondJun 5, 1997: 5.65 ft, minor flooding; 1,560 cubic feet per secondMay 24, 2000: 3.68 ft, below flood stage; 472 cubic feet per secondMay 16, 2001: 3.20 ft, below flood stage; 308 cubic feet per secondJun 1, 2002: 3.94 ft, below flood stage; 577 cubic feet per secondMay 31, 2003: 5.45 ft, minor flooding; 1,410 cubic feet per secondJun 6, 2004: 3.41 ft, below flood stage; 375 cubic feet per secondMay 20, 2005: 5.36 ft, minor flooding; 1,350 cubic feet per secondMay 21, 2006: 6.41 ft, minor flooding; 2,170 cubic feet per secondMay 13, 2007: 3.30 ft, below flood stage; 325 cubic feet per secondMay 20, 2008: 3.95 ft, below flood stage; 565 cubic feet per secondJun 20, 2009: 4.42 ft, below flood stage; 784 cubic feet per secondJun 7, 2010: 4.70 ft, below flood stage; 934 cubic feet per secondJun 24, 2011: 4.71 ft, below flood stage; 940 cubic feet per secondApr 26, 2012: 5.13 ft, minor flooding; 1,190 cubic feet per secondJun 11, 2013: 3.72 ft, below flood stage; 475 cubic feet per secondMay 28, 2014: 3.44 ft, below flood stage; 373 cubic feet per secondJun 9, 2015: 3.78 ft, below flood stage; 535 cubic feet per secondJun 6, 2016: 4.17 ft, below flood stage; 700 cubic feet per secondJun 5, 2017: 6.02 ft, minor flooding; 1,850 cubic feet per secondMay 26, 2018: 4.48 ft, below flood stage; 820 cubic feet per secondJun 7, 2019: 4.86 ft, action stage; 1,030 cubic feet per secondDec 13, 2024: 5.46 ft, minor flooding; 1,420 cubic feet per second Highest, 6.41 ft, May 21, 2006 1960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, North Fork Big Lost River at Wild Horse 1950s: 2 1960s: 2 1970s: 1 1980s: 2 1990s: 2 2000s: 3 3 2010s: 2 2020s: 1 1950s1960s1970s1980s1990s2000s2010s2020s
  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, North Fork Big Lost River at Wild Horse
1May 21, 20066.41+1.30Minor2,170
2Jun 12, 19656.39+1.28Minor1,420
3May 25, 19676.23+1.12Minor1,380
4May 24, 19566.18+1.07Minor1,270
5Jun 5, 20176.02+0.91Minor1,850
6Jun 17, 19745.92+0.81Minor1,300
7May 30, 19865.85+0.74Minor1,440
8May 22, 19585.84+0.73Minor1,200
9May 30, 19835.78+0.67Minor1,180
10Jun 5, 19975.65+0.54Minor1,560
11Jun 5, 19955.59+0.48Minor1,390
12Dec 13, 20245.46+0.35Minor1,420
13May 31, 20035.45+0.34Minor1,410
14May 20, 20055.36+0.25Minor1,350
15Apr 26, 20125.13+0.02Minor1,190
16Jun 7, 20194.86−0.25Action1,030
17Jun 24, 20114.71−0.40Below flood stage940
18Jun 7, 20104.70−0.41Below flood stage934
19May 26, 20184.48−0.63Below flood stage820
20Jun 20, 20094.42−0.69Below flood stage784
21Jun 6, 20164.17−0.94Below flood stage700
22May 20, 20083.95−1.16Below flood stage565
23Jun 1, 20023.94−1.17Below flood stage577
24Jun 9, 20153.78−1.33Below flood stage535
25Jun 11, 20133.72−1.39Below flood stage475
26May 24, 20003.68−1.43Below flood stage472
27May 28, 20143.44−1.67Below flood stage373
28Jun 6, 20043.41−1.70Below flood stage375
29May 13, 20073.30−1.81Below flood stage325
30May 16, 20013.20−1.91Below flood stage308

Other gauges in Custer County

Flood gauges in Custer County
Howell Ranch4.16.02 ft, May 25, 19670
Mackay Reservoir4.36.08 ft, Jun 6, 19860
Bruno Ck6.26.53 ft, May 7, 20170
Yankee Fork9.510.64 ft, Jun 5, 20170
Stanley3.14.60 ft, May 29, 19130
Clayton11.012.25 ft, Jun 1, 20170

Custer County: every hazard · River floods across the country · Idaho

NOAA National Water Prediction Service, gauge BLRI1, 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.