Pine Hollow Reservoir
Wasco County, Oregon235 acresView mapDirections
Nutrients and algae run above the regional average.
↓ down from A at the last regrade
- Mesotrophic
- #1 of 1 in the county
- 21 ft max depth
- Public access
- Limited data
Pine Hollow Reservoir in Wasco County, Oregon has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 4.5 µg/L. Surface area: 235 acres.
- Max depth
- ~21 ft est.
- Area
- 235 acres
- Type
- Mesotrophic
- Chlorophyll-a
- 4.5 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Pine Hollow Reservoir’s letter
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Pine Hollow Reservoir is a 235-acre mesotrophic lake in Wasco County, Oregon with an estimated average depth of about 21 feet. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. 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 2025-09-25. Grade methodology: LakeQuality methodology.
What Pine Hollow Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Chlorophyll-a 4.5 µg/L. TSI 45. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 4.5 µg/L | Poor |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~21 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 235 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oregon has not published bathymetry for Pine Hollow Reservoir.
Lake Size & Watershed
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
- Pine Hollow Reservoir South ShorePublic
- Pine Hollow Reservoir ResortSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Pine Hollow Reservoir
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Chlorophyll-a | ↓ Declining | +1.4 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Pine Hollow Reservoir is a man-made reservoir impounded by the Pine Hollow (completed 1969), built primarily for irrigation on the Badger Creek & Pine Hollow Creek; earth-type dam, 66 ft tall and 800 ft long.
- Surface area
- 235 ac
- Normal storage
- 4,750 ac-ft
- Max storage
- 5,300 ac-ft
- Drainage area
- 4.5 sq mi
- Hazard class
- High
- Owner
- BADGER IMPROVEMENT DISTRICT
All listed purposes: Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID OR00480 · Operator website
County Ranking
Ranked #1 of 1 lakes in Wasco County
Nearby Lakes in Wasco County
Frequently asked questions about Pine Hollow Reservoir
Where is Pine Hollow Reservoir?
- Pine Hollow Reservoir is a lake in Wasco County, Oregon. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Pine Hollow Reservoir?
- Pine Hollow Reservoir in Wasco County, Oregon has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 4.5 µg/L. Surface area: 235 acres.
Is Pine Hollow Reservoir safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Pine Hollow Reservoir?
- No published bathymetric survey covers Pine Hollow Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 21 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 235 acres.
Are there boat ramps on Pine Hollow Reservoir?
- Pine Hollow Reservoir has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Pine Hollow Reservoir South Shore, Pine Hollow Reservoir Resort. Public access is listed as yes.
Explore Pine Hollow Reservoir across LakeQuality
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Mesotrophic 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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory