Where is McCormack Slough?

McCormack Slough is a lake in Morrow County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.

McCormack Slough

Morrow County, Oregon248 acresView map Directions

No nutrient or algae sampling on record from Oregon DEQ for this lake.

Area

248 acres

Surface area

Shoreline

7.4 mi

Measured length

See the measurements Directions Where to stay

McCormack Slough in Morrow County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Surface area: 248 acres.

Loading map…

McCormack Slough is a 248-acre lake in Morrow County, Oregon.

Source: EPA Water Quality Portal sampling records, Oregon DEQ. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether McCormack Slough is safe to swim in today is a call for the Oregon Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for McCormack Slough →

Water quality measurements for McCormack Slough

These are the measurements Oregon DEQ publishes for McCormack Slough, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about McCormack Slough

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

248 acres

Shoreline

7.4 mi

No bathymetric survey has been published for McCormack Slough, so its depth is not documented here.

Stays via Stay22

Stays near McCormack Slough

Compare lakeside cabins, hotels, and vacation rentals near McCormack Slough in Morrow County, Oregon — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near McCormack Slough

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Oregon’s top lakes →

Follow McCormack Slough’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing McCormack Slough

→ McCormack Slough fishing regulations (limits, seasons, special rules)

Nearby Lakes in Morrow County

Carty Reservoir18.6 miView →Lake Umatilla20.2 miView →Willow Creek Reservoir9.8 ft clear—View →Lake Penland—View →

Frequently asked questions about McCormack Slough

Where is McCormack Slough?: McCormack Slough is a lake in Morrow County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of McCormack Slough?: McCormack Slough in Morrow County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Surface area: 248 acres.
Is McCormack Slough safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.