Crowley Lake/Lake Crowley (Long Valley Lake/Lone Valley Lake)
- Lake name:
- Crowley Lake/Lake Crowley (Long Valley Lake/Lone Valley Lake)
- Location:
- California
- HydroLAKE ID:
- 9275
- GRanD ID:
- 566
- Latitude:
- 37.6095857
- Longitude:
- -118.7409880
- Surface area (km2):
- 16
- Basin type:
- reservoir
- Dam completion date:
- 1941
- Management agency:
- California Department of Fish and Wildlife
- Lake use:
- recreation
- Region associations:
- Eastern Sierra; Los Angeles
- Comments:
- Los Angeles Aqueduct System's largest reservoir.
Summary of Surveys (3)
Survey Citation:
Ackerman, J. T., C. A. Hartman, C. A. Eagles-Smith, M. P. Herzog, J. Davis, G. Ichikawa, and A. Bonnema. 2015. Estimating mercury exposure of piscivorous birds and sport fish using prey fish monitoring. Environmental Science & Technology 49:13596–13604.
-
Type
boat -
Time period
April 2012, October 2013 -
Source
Peer-reviewed -
Both Western and Clarks?
Y
| Count Type | Range | Max | Year |
|---|---|---|---|
| Max Adults | 1 to 100 | presence? | 2012 |
| Most Recent Adults | 1 to 100 | presence? | 2012 |
| Max Nests | N/A | N/A | N/A |
| Most Recent Nests | N/A | N/A | N/A |
| Max Chicks | N/A | N/A | N/A |
| Most Recent Chicks | N/A | N/A | N/A |
Comments:
Not a survey but grebes were sampled at 25 lakes in CA from April to October of 2012 (13 lakes) and 2013 (12 lakes). An average of 14 grebes per lake (from 2 to 38 grebes) were captured at night with night-lights. No breakdown of actual numbers captured per lake was provided. Morphometry and molt data, along with blood was collected from each bird for mercury analysis, and sex determination via genetic analysis. From 7 out of the 25 lakes, an average of 14 grebe eggs (from 6 to 23 eggs) were collected. An egg from each randomly sampled nest was collected either from an active nest (random egg) or from an abandoned nest (abandoned egg). Prey fish and sport fish were also sampled an average of 11 days after grebe sampling. At Crowley Lake, no grebe eggs were collected in 2012 (Figure SI). 354 grebes were captured total from the 25 lakes, 71% were Western grebes, 29% were Clark's, 48% were female, 52% were male. 101 grebe eggs were collected from 7 lakes, of which 62% were Western grebes, 15% were Clark's grebes, 23% were unidentified which. Grebe blood, eggs, and sport fish mercury concentrations were strongly correlated to mercury concentrations in prey fish at the lakes. Grebe mercury concentrations were also strongly correlated with sport fish mercury concentrations. This study showed that prey fish monitoring can estimate mercury exposure of grebes and other piscivorous birds if these birds can't be sampled directly.
Survey Citation:
Ivey, G. L. 2004. Conservation assessment and management plan for breeding Western and Clark’s Grebes in California. Unpublished technical report. American Trader Trustee Council, California. . Accessed 15 January 2020.
-
Time period
1990s -
Source
Conservation Assessment, Management Plan -
Both Western and Clarks?
Y
| Count Type | Range | Max | Year |
|---|---|---|---|
| Max Adults | 1 to 100 | presence | 1990s |
| Most Recent Adults | 1 to 100 | presence | 1990s |
| Max Nests | N/A | N/A | N/A |
| Most Recent Nests | N/A | N/A | N/A |
| Max Chicks | N/A | N/A | N/A |
| Most Recent Chicks | N/A | N/A | N/A |
Comments:
This entry to capture historical record of breeding grebes in CA prior to 2002. There were breeding grebes in Crowley Lake in the 1990s, no numbers or other details. Source is D. Shuford, pers. comm.
Survey Citation:
Ivey, G.L., and C.P. Herziger. 2006. Intermountain west waterbird conservation plan, version 1.2. A plan associated with the Waterbird Conservation for the Americas Initiative. Published by U.S. Fish and Wildlife Service Pacific Region, Portland, Oregon.
-
Time period
1990, 1995 -
Source
Conservation Plan -
Both Western and Clarks?
N
| Count Type | Range | Max | Year |
|---|---|---|---|
| Max Adults | 101 to 500 | 148 | 1990-1995 |
| Most Recent Adults | 101 to 500 | 148 | 1990-1995 |
| Max Nests | N/A | N/A | N/A |
| Most Recent Nests | N/A | N/A | N/A |
| Max Chicks | N/A | N/A | N/A |
| Most Recent Chicks | N/A | N/A | N/A |
Comments:
Appendix D, Table D-2, 64 pairs is the 1990 - 1995 average, population data source is Shuford and Metropulos 1996. Area population estimate is therefore 128 for Western grebes, 20 for Clark's grebes..
Sources of Information
- Lehner, B., C. Reidy Liermann, C. Revenga, C. Vorosmarty, B. Fekete, P. Crouzet, P. Doll, M. Endejan, K. Frenken, J. Magome, C. Nilsson, J.C. Robertson, R. Rodel, N. Sindorf, and D. Wisser. 2011. Global Reservoir and Dam Database, Version 1 (GRanDv1): Dams, Revision 01. Palisades, New York: NASA Socioeconomic Data and Applications Center (SEDAC).
- Crowley Lake Information
- Crowley Lake Economic Development
- Geographic Names Information System (GNIS)
- Crowley Lake Water Quality