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Big Bass Program — 2026 Fishing Summary, p. 11 Panfish Enhancement Special Regulations — 2026 Fishing Summary, p. 15
Latest PFBC survey
May 2019 (7 years ago)
On the 2026 trout schedule
Yes — 4 dates, as published Oct 4, 2026
Fish-consumption advisory
No lake-specific row in the 2026 list
Ice-fishing list
On PFBC's ice-fishing destination list (retrieved Oct 4, 2026)
Mentored Youth
Flagged as a Mentored Youth water in PFBC's lake data (retrieved Oct 4, 2026)
PFBC trout program
Stocked Trout Water, open to year-round fishing — PFBC GIS data. PFBC data, Aug 2026
Twin Lakes Number One Reservoir (Lower) covers 30 acres in Westmoreland County. PFBC biologists last reported on it in May 2019. It has 4 dates on PFBC's 2026 adult trout schedule, as published Oct 4, 2026. The 2026 advisory has no lake-specific row for it; the statewide one-meal-a-week advice applies.
What PFBC biologists found
May 2019 survey · 7 years ago
PFBC biologist report
Gear: night electrofishing, trap nets, hoop nets
Night electrofishing captured 315 Largemouth Bass in 2019. (p. 2)
The survey captured 64 Channel Catfish from 7 to 28 inches long. (p. 3)
Of 59 fin-clipped Channel Catfish captured, 56 had been stocked as yearlings. (p. 3)
Trap nets captured 58 Black Crappie, with 59% over 9 inches. (p. 3)
Trap nets captured 195 Bluegill, with 39% over 7 inches. (p. 3)
PFBC's plan, in our words: PFBC will continue monitoring bass populations at both Twin Lakes using night electrofishing; the report indicates regulation changes may not be warranted. (p. 3)
Night electrofishing captured 295 Largemouth Bass in 2018. (p. 2)
The survey captured 39 Channel Catfish ranging from 8 to 27 inches. (p. 3)
Of the captured Channel Catfish, 31 had been stocked as yearlings. (p. 3)
Trap nets captured 49 Black Crappie measuring 4 to 14 inches. (p. 3)
Trap nets captured 166 Bluegill, with 36% over 7 inches. (p. 3)
PFBC's plan, in our words: PFBC recommends retaining bass regulations at both Twin Lakes, continuing bass monitoring, and returning for additional Channel Catfish sampling to determine ages and origins. (p. 3)
Open to year-round fishing; no trout may be kept from February 16 until the opener (2026 Fishing Summary, p. 23).
Fish consumption advice (2026 list)
No lake-specific advice for Twin Lakes Number One Reservoir (Lower) in the 2026 list.
Statewide advice:“Pennsylvania has issued a general, statewide health advisory for recreationally caught sport fish: eat no more than one meal (1/2 pound) per week of sport fish caught in the state’s waterways.”
“People who regularly eat sport fish, women of childbearing age and children are particularly susceptible to contaminants that build up over time.”
“Fish stocked from PFBC state fish hatcheries are subject to the blanket one-meal-per-week consumption advisory that applies to recreationally caught sport fish in Pennsylvania.”
DEP: “The advisory listing was current at the time this summary went to press. Fish consumption advisories may have been issued or lifted since that time.”
Largemouth, Smallmouth and Spotted Bass: 15-inch minimum and 4 a day (combined) from Jan. 1 through April 10 and from June 13 through Dec. 31; catch and immediate release only from April 11 through June 12, with no tournaments. Other species follow inland rules.
Summarized. The current Pennsylvania Fishing Summary, 58 Pa. Code and posted signs govern.
Habitat plan and ice-fishing list
On PFBC's ice-fishing destination list (retrieved Oct 4, 2026). Species PFBC lists for ice fishing here: Largemouth Bass, Trout (stocked), panfish, Channel Catfish.
This site has no ice reports; conditions change daily; never assume ice is safe.
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Questions about Twin Lakes Number One Reservoir (Lower)
Is Twin Lakes Number One Reservoir (Lower) stocked with trout?
PFBC lists Twin Lakes Number One Reservoir (Lower) on its adult trout schedule for 2026: 4 dates, as published Oct 4, 2026. Dates can change; check PFBC's schedule.
When is Twin Lakes Number One Reservoir (Lower) on PFBC's trout-stocking schedule in 2026?
As published Oct 4, 2026: Mar 17, 2026; Apr 14, 2026; Apr 21, 2026; Oct 14, 2026. PFBC: “All stocking events are subject to change without notice.”
Can you eat fish from Twin Lakes Number One Reservoir (Lower)?
The 2026 advisory has no lake-specific row for Twin Lakes Number One Reservoir (Lower). The statewide advice — no more than one meal (1/2 pound) a week of sport fish — still applies. Not medical advice.
What fish are in Twin Lakes Number One Reservoir (Lower)?
PFBC's May 2019 survey recorded: Largemouth Bass, Channel Catfish, Black Crappie, White Crappie, Yellow Perch, Bluegill, Pumpkinseed, Hybrid Sunfish, Brown Bullhead, Yellow Bullhead, Brown Trout, Rainbow trout, White Sucker. Surveys record what biologists caught with their gear on those days, not everything in the lake.
Is Twin Lakes Number One Reservoir (Lower) a Big Bass lake?
Yes. PFBC's special-regulation data and the 2026 Fishing Summary (p. 11) list it in the Big Bass Program: Largemouth, Smallmouth and Spotted Bass: 15-inch minimum and 4 a day (combined) from Jan. 1 through April 10 and from June 13 through Dec. 31; catch and immediate release only from April 11 through June 12, with no tournaments. Other species follow inland rules.