Independent site — not affiliated with or endorsed by the Pennsylvania Fish and Boat Commission (PFBC) or the PA Department of Environmental Protection (DEP). Official sources are linked on every page.

Mcwilliams Reservoir fishing almanac

Northeast region Columbia County

At a glance

Size and owner: 183 acres · Other owner — PFBC data, retrieved Oct 4, 2026
Special regulations: Catch and Release Lakes — 2026 Fishing Summary, p. 15
On the 2026 trout schedule: No (as published Oct 4, 2026)
Fish-consumption advisory: Yes — 2026 list

Mcwilliams Reservoir covers 183 acres in Columbia County. The 2026 advisory lists Largemouth Bass here at 2 meals/month. It is in PFBC's Catch and Release Lakes (2026 Fishing Summary).

On PFBC's 2026 trout-stocking schedule

Mcwilliams Reservoir is not on PFBC's 2026 adult trout schedule (as published Oct 4, 2026).

Fish consumption advice (2026 list)

2026 DEP/PFBC fish consumption advisory, updated Feb 27, 2026.
Species	Meal advice	Contaminant	Area
Largemouth Bass	2 meals/month	Mercury	Entire reservoir

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.”

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.”

DEP fish consumption advisories Before you go: check DEP's harmful algal bloom page

Quoted word for word from the advisory for the year shown; advisories may have been issued or lifted since. Not medical advice.

Special fishing regulations (2026 Fishing Summary)

Catch and Release Lakes

2026 Summary p. 15

Catch and release for all fish species, all year: no fish may be kept, and every fish must be returned unharmed right away.

2026 Fishing Summary, p. 15

Summarized. The current Pennsylvania Fishing Summary, 58 Pa. Code and posted signs govern.

Local bait & guides (sponsored)

Questions about Mcwilliams Reservoir

Can you eat fish from Mcwilliams Reservoir?

The 2026 DEP/PFBC advisory lists: Largemouth Bass — 2 meals/month (Mercury). The statewide advice is one meal a week of sport fish. Not medical advice.

Report a data error

Sources for this page: PFBC Lakes_Point (Oct 4, 2026); PFBC adult trout schedule (as published Oct 4, 2026); DEP/PFBC fish consumption advisory (2026 list, updated Feb 27, 2026); PFBC special-regulation data (Mar 2026); 2026 Pennsylvania Fishing Summary. All sources

Last data import Oct 5, 2026