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Boca Reservoir

Highest listed crest 5,605.55 ftFlood stage 5,605.0 ft23 crests since 1940

The Boca Reservoir crested above flood stage 18 times among the 23 crests the National Weather Service lists from 1940 to 1975. The highest, 5,605.55 ft on December 23, 1955, was minor flooding, 0.55 feet above flood stage.

The gauge

Highest listed crest
5,605.55 ft
December 23, 1955; 41,440 cubic feet per second
Flood stage
5,605.0 ft
Major flooding from 5,607.0 ft
Crests at major
0
18 above flood stage
Most recent flood crest
July 24, 1975
5,605.35 ft, minor flooding
Location
Nevada County
Near Truckee (5.8 mi)

Flood stages

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

Flood categories, Boca Reservoir
Action stage5,604.54Jun 30, 1949The level at which the NWS or its partners begin to take action
Flood stage (minor)5,605.018Jul 24, 1975Minimal or no property damage, but possibly some public threat
Moderate flood stage5,606.00—Some inundation of structures and roads near the stream
Major flood stage5,607.00—Extensive inundation of structures and roads

Every listed crest

23 crests from 1940 to 1975. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Boca Reservoir, 1940 to 1975 5604560556065607ft Flood stage 5,605.0 ftMajor 5,607.0 ft May 31, 1940: 5,604.60 ft, action stage; 40,450 cubic feet per secondJun 30, 1941: 5,604.80 ft, action stage; 40,700 cubic feet per secondJun 30, 1942: 5,605.10 ft, minor flooding; 40,950 cubic feet per secondJun 30, 1945: 5,604.50 ft, action stage; 40,380 cubic feet per secondMay 31, 1947: 5,604.30 ft, below flood stage; 40,170 cubic feet per secondMay 31, 1948: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondJun 30, 1949: 5,604.50 ft, action stage; 40,320 cubic feet per secondJun 30, 1950: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondMay 31, 1951: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondJun 30, 1952: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondJun 30, 1953: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondMay 31, 1954: 5,605.00 ft, minor flooding; 40,850 cubic feet per secondDec 23, 1955: 5,605.55 ft, minor flooding; 41,440 cubic feet per secondJun 30, 1956: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondMay 31, 1957: 5,605.05 ft, minor flooding; 40,900 cubic feet per secondJun 30, 1958: 5,605.10 ft, minor flooding; 40,950 cubic feet per secondMay 31, 1960: 5,605.18 ft, minor flooding; 41,050 cubic feet per secondJun 2, 1962: 5,605.10 ft, minor flooding; 41,000 cubic feet per secondJun 1, 1963: 5,605.18 ft, minor flooding; 41,050 cubic feet per secondJul 15, 1967: 5,605.10 ft, minor flooding; 41,000 cubic feet per secondJun 15, 1969: 5,605.25 ft, minor flooding; 41,100 cubic feet per secondMay 1, 1973: 5,605.10 ft, minor flooding; 41,000 cubic feet per secondJul 24, 1975: 5,605.35 ft, minor flooding; 41,200 cubic feet per second Highest, 5,605.55 ft, Dec 23, 1955 1940195019601970

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Boca Reservoir 1940s: 2 1950s: 9 9 1960s: 5 1970s: 2 1940s1950s1960s1970s
  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, Boca Reservoir
1Dec 23, 19555,605.55+0.55Minor41,440
2Jul 24, 19755,605.35+0.35Minor41,200
3Jun 15, 19695,605.25+0.25Minor41,100
4May 31, 19605,605.18+0.18Minor41,050
5Jun 1, 19635,605.18+0.18Minor41,050
6Jun 30, 19425,605.10+0.10Minor40,950
7Jun 30, 19585,605.10+0.10Minor40,950
8Jun 2, 19625,605.10+0.10Minor41,000
9Jul 15, 19675,605.10+0.10Minor41,000
10May 1, 19735,605.10+0.10Minor41,000
11May 31, 19485,605.05+0.05Minor40,900
12Jun 30, 19505,605.05+0.05Minor40,900
13May 31, 19515,605.05+0.05Minor40,900
14Jun 30, 19525,605.05+0.05Minor40,900
15Jun 30, 19535,605.05+0.05Minor40,900
16Jun 30, 19565,605.05+0.05Minor40,900
17May 31, 19575,605.05+0.05Minor40,900
18May 31, 19545,605.000.00Minor40,850
19Jun 30, 19415,604.80−0.20Action40,700
20May 31, 19405,604.60−0.40Action40,450
21Jun 30, 19455,604.50−0.50Action40,380
22Jun 30, 19495,604.50−0.50Action40,320
23May 31, 19475,604.30−0.70Below flood stage40,170

Other gauges in Nevada County

Flood gauges in Nevada County
Donner Lk Nr Truckee5.56.63 ft, Jan 2, 19970
Truckee8.012.76 ft, Jan 2, 19972
Farad11.014.37 ft, Nov 21, 19504

Nevada County: every hazard · River floods across the country · California

NOAA National Water Prediction Service, gauge BCVC1, 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.