Cullaby Lake
Clatsop County, OregonView mapDirections
Oregon DEQ publishes the water-quality measurements for Cullaby Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · Algal growth
- 46 ft max depth
- Public access
- Limited data
Cullaby Lake in Clatsop County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Chlorophyll-a (algae): 36.8 µg/L.
Cullaby Lake is a highly nutrient-loaded hypereutrophic lake in Clatsop County, Oregon with an estimated average depth of about 46 feet. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, last sampled 2025-10-15. Methodology: how these readings are compared.
What Cullaby Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Cullaby Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants. Check local advisories before you swim.
Whether Cullaby Lake 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.
Water quality measurements for Cullaby Lake
These are the measurements Oregon DEQ publishes for Cullaby Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 36.8 µg/L. TSI 66.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 36.8µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 66 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Cullaby Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~46 ft est.
Public access
Yes
Listed by Oregon DEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oregon has not published bathymetry for Cullaby Lake.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Surface area
173 acres
HydroLAKES / HydroSHEDS
Shoreline
4.6 mi
HydroLAKES / HydroSHEDS
Elevation
20 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Cullaby Lake ParkPublic
- CarnahanPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Cullaby Lake
Compare lakeside cabins, hotels, and vacation rentals near Cullaby Lake in Clatsop 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Cullaby Lake are listed below.
Top-rated places to stay near Cullaby Lake
Prices for Oct 30–Nov 1, 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 trip? Cabins and lodging at Cullaby Lake → · more Oregon lake trips
Follow Cullaby Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Cullaby Lake
Water quality readings over time
2 seasons of samples on record (2024–2025). Calling a direction takes at least 4 years of the same measurement.
Chlorophyll-a
Stable+0.1 µg/L/yr2 years
EPA Impairment Status
Cullaby Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Fish consumption, Recreation, Other.
Source: EPA ATTAINS assessment unit OR_LK_1708000602_05_100655 · Official waterbody report
Nearby Lakes in Clatsop County
Frequently asked questions about Cullaby Lake
Where is Cullaby Lake?
- Cullaby Lake is a lake in Clatsop County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of Cullaby Lake?
- Cullaby Lake in Clatsop County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Chlorophyll-a (algae): 36.8 µg/L.
Is Cullaby Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Cullaby Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants. Check local advisories before you swim.
How deep is Cullaby Lake?
- No published bathymetric survey covers Cullaby Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 46 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Cullaby Lake?
- Cullaby Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Cullaby Lake Park, Carnahan. Public access is listed as yes.
Can I fish at Cullaby Lake?
- Cullaby Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Oregon's fish and wildlife agency, so check its current regulations before you go.
Explore Cullaby Lake across LakeQuality
More lakes in Oregon
Other Lakes in Oregon
Hypereutrophic Lakes in Oregon
Where this data comes from
8 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Department of Environmental Quality - State of Oregon
OREGONDEQ8 samples · 2024–2025
Analytical methods
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory