As someone who is part of an organization that buys and stocks trout so kids can fish for them, I can attest that the cost of approved (certified not carrying diseases) is substantial. We recently paid on the order of nearly $10,000 for just about 2,000 trout in the 10-12 inch range.
We used to get a few hundred bruisers (15-18 inches) to spice it up for the kids, but those cost on the order of $10 per fish these days.
Five to eight years ago, we were paying closer to $3,000 for 2,000 trout, including a few big ones.
And it looks like costs are going up again next year.
Maryland DNR reports that the cost for everything from certified disease free eggs, to trout chow to transport from hatchery to creek are way up, which affects what the state can afford to stock.
Even the allenberry crew will struggle to pay that much.
On the bright side, stream improvement to enhance wild trout increasingly seems like a bargain.
Still, damn shame that allenberry section is no longer public. I have a lot of great memories from fishing there with my dad.