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Mammoth Dam home to mammoth largemouth bass, crappies

Everybody Adventures | Bob Frye
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PA Fish and Boat Commission
Fish and Baot Commission fisheries biologist aide Christine Edwards holds the 23-inch, 10-pound largemouth bass from Mammoth Lake.

To say fishermen sometimes stretch the truth is to say the sky is sometimes blue, the grass is sometimes green and oranges are sometimes, well, orange.

Exaggerations, tall tales, even good-natured if otherwise bald-faced lies. Those are often their stock in trade.

Often.

But not this time.

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Biologists from the Pennsylvania Fish and Boat Commission’s area 8 office in Somerset descended on 25-acre Mammoth Dam in Westmoreland County earlier this year to assess its fish population. They last examined the lake in spring of 2010.

Anglers told them this time around to expect good things.

“There were guys telling us they catch trophy bass in there,” biologist Mike Depew said. “And there were multiple ones who came up to us and said that there’s a 10-pounder in there.

“And sure enough, they were right.”

When biologists pulled in one of their trap nets, usually full of panfish, they collected a 23-inch, 10-pound largemouth.

That’s not far off the state record.

The biggest largemouth recorded in Pennsylvania is the 11-pound, 3-ounce fish caught in 1983 by the late Donald Shade of Waynesboro. That fish came from the now-gone Birch Run Lake in Adams County.

There have been stories of people catching even bigger largemouths since.

For example, Gary Smith, the commission’s area 8 fisheries manager, said one fisherman reported catching a largemouth weighing more than 12 pounds from Lower Twin Lake, another Westmoreland County park lake, several years ago.

That angler, though, never had the catch verified. Instead, he reportedly released the fish to the water.

And no one’s touched the record otherwise.

Smith said it’s hard to say whether Mammoth Dam’s mammoth 10-pounder could continue to grow and perhaps do that at some point.

Genetically speaking, that bass could have reached its peak already, he said. Or it might not have.

If it continues to grow before succumbing to an angler or old age, it likely won’t get a lot longer, Smith said. Instead, it would pack on additional weight.

It’s asking a lot of a Pennsylvania largemouth to get much bigger than that one already is, he said. But no one can rule it out.

“There’s always that possibility. That state record is a pretty old one, so it will be tough to beat,” Smith said.

“But there’s always that chance.”

Whatever happens, that monster largemouth is hardly Mammoth Dam’s only bass or even its only big one.

Commission standards label a bass lake a quality one if it produces 35 total bass per hour of electrofishing survey work.

Mammoth gave up 267 per hour.

“Being high like that is not great if the fish aren’t big, however,” Depew said.

But Mammoth shined there, too.

Commission standards for a good bass lake also require catches of seven bass per hour exceeding 12 inches and two per hour exceeding 15.

Mammoth produced 85 fish per hour exceeding 12 inches and 30 per hour exceeding 15.

“So those are some pretty outstanding numbers,” Depew said. “We handled numerous 6- and 7-pounders there.”

Ten largemouths measured longer than 20 inches, he said.

Anglers can fish the lake using nonmotorized canoes and kayaks from May 31 to Oct. 31. It’s open to shore fishing year-round, with good bank access almost the entire way around, and ice fishing in winter.

“And the bass are pretty well distributed throughout the lake. You can find them anywhere,” Depew said.

“So if you’re looking for a good place, a good accessible lake, to fish where there’s a good opportunity for catching a trophy bass, Mammoth is definitely a place for that.”

Other big fish in Mammoth Dam

Need a reason to fish Mammoth Dam besides its trophy largemouth bass?

Here’s one.

The lake’s crappie population is “abundant and sizable,” Depew said.

Biologists caught 257 crappies total, with blacks and whites represented in equal numbers.

“There were fish pushing 16 inches or so,” Depew said. “And there were plenty of those desirable-size fish: 10-, 11-, 12-inch crappies.”

Biologists found a good many of those crappies around the lake’s island, he said. Spring, when crappies spawn, and fall, when they are feeding heavily before winter, would be good times to target crappies there, Depew said.

Article by Bob Frye,
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