Biologist reports logo
Twin Lake Number Two Reservoir
(Upper Twin Lake)
Westmoreland County
May 2009
Survey Gear: Night Electrofishing and Pennsylvania Style Trap Nets

Upper Twin Lake is a 20 acre impoundment located in Westmoreland County near the city of Greensburg. Upper Twin Lake and Lower Twin Lake combine to form Twin Lakes Park, a popular and heavily used recreational area that is part of the Westmoreland County Parks system. Upper Twin Lake is a clear, productive lake with a maximum depth of approximately 30 ft. The lake is managed for bass under Big Bass regulations and for crappie with Panfish Enhancement regulations. In addition, Upper Twin Lake is an Stocked Trout Water. The lake is stocked with catchable on four occasions, during the Preseason, Inseason, Fall, and Late Winter periods, creating coldwater fishing opportunities in all seasons except summer. Self-sustaining warmwater and coolwater fish populations provide fishing opportunities in summer and year-round.

Fisheries Management personnel of the Pennsylvania Fish and Boat Commission surveyed Upper Twin Lake in early May. The purpose of the survey was to assess the lakes’ gamefish and panfish populations as well as to assess management strategies for the lake. The survey was conducted using night flatbottom boat electrofishing and six trap net sets.

Table 1: Largemouth bass night electrofishing catch
Length (inches) 1994 2009
3 1 0
4 13 6
5 19 9
6 7 0
7 1 1
8 15 13
9 31 30
10 50 49
11 14 41
12 6 13
13 2 1
14 1 0
Total 160 163

A total of 163 bass were collected during nighttime electrofishing. However, only 9% were greater than 12 inches in length and none of the bass were over the legal length of 15 inches. The previous survey of Upper Twin Lake in 1994 also indicated an abundance of small bass, with only 6% greater than 12 inches in length and none over 15 inches.

Trap nets yielded low numbers of crappie, but quality sized fish were available. A total of 55 crappies were handled in 2009, with 38% of the fish exceeding the legal length of 9 inches. This was an improvement from 1994, when only 23% of the crappie were greater than 9 inches.

White crappie
Area 8 Fisheries Manager Rick Lorson with a 16 inch, 2.2 lb. white crappie

Bluegill catch from the trap nets was fair, with decent numbers of fish in the 6 and 7 inch range. Bluegill over 7 inches comprised 26% of the total bluegill catch. Yellow perch also provide a quality fishery that anglers can target. A total of 59 yellow perch were captured in trap nets with the majority of fish (71%) greater than 9 inches in length.

Yellow perch
Area 8 Fisheries Biologist Mike Depew with two quality sized yellow perch

Other species captured during our survey included rainbow trout, pumpkinseed, common carp, green sunfish, brown bullhead, and channel catfish. A few quality channel catfish are likely to be encountered by anglers.

A 20 inch, 3.5 lb channel catfish

Upper Twin Lake provides angling opportunities for stocked rainbow trout, largemouth bass, and panfish.

Table 2. Fish species captured from night electrofishing and trap netting at Upper Twin Lake during May 2009.
Fish Species Number Collected Size Range (inches) Additional Comments
Largemouth bass 171 4-13 in 9% over 12 in
Black crappie 14 7-9 in 43% over 9 in
White crappie 41 3-16 in 37% over 9 in
Yellow perch 59 6-12 in 71% over 9 in
Bluegill 145 2-8 in 26% over 7 in
Pumpkinseed 33 3-7 in 15% over 7 in
Green sunfish 6 4-6 in  
Channel catfish 2 9-20 in  
Brown bullhead 2 11-12 in  
Common carp 2 Not measured  
Rainbow trout 40 Not measured  
-- Prepared by Area 8 Fisheries Biologist Mike Depew

Biologist Reports -- PFBC Home

Copyright Notice
Commonwealth of Pennsylvania Web Privacy and Security Policies