Henry'S Lake @ Boat Ramp
Fremont County, IdahoView mapDirections
This is the name Idaho DEQ records for this water. It can describe one sampling location rather than the water as a whole.
Idaho DEQ publishes the water-quality measurements for Henry'S Lake @ Boat Ramp. Here is what has been measured.
- 158 ft max depth
- Public access
- Limited data
Henry'S Lake @ Boat Ramp in Fremont County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
Henry'S Lake @ Boat Ramp is a lake in Fremont County, Idaho with an estimated average depth of about 158 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2018-07-18. Methodology: how these readings are compared.
What Henry'S Lake @ Boat Ramp is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Henry'S Lake @ Boat Ramp is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Henry'S Lake @ Boat Ramp
These are the measurements Idaho DEQ publishes for Henry'S Lake @ Boat Ramp, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 11 µg/L. Chlorophyll-a 1.5 µg/L. TSI 37.
| 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 | 11µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 1.5µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Henry'S Lake @ Boat Ramp
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~158 ft est.
Public access
Yes
Listed by Idaho DEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Idaho has not published bathymetry for Henry'S Lake @ Boat Ramp.
Lake Size & Watershed
Watershed (drainage) area
94 sq mi
HydroLAKES / HydroSHEDS
Surface area
6,205 acres
HydroLAKES / HydroSHEDS
Shoreline
15.3 mi
HydroLAKES / HydroSHEDS
Elevation
6,480 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
- Henrys Lake State ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Fishing Henry'S Lake @ Boat Ramp
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Frequently asked questions about Henry'S Lake @ Boat Ramp
Where is Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp is in Fremont County, Idaho. This is the name Idaho DEQ records for this water. It can describe one sampling location rather than the water as a whole. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp in Fremont County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 1.5 µg/L.
Is Henry'S Lake @ Boat Ramp safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Henry'S Lake @ Boat Ramp?
- No published bathymetric survey covers Henry'S Lake @ Boat Ramp, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 158 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 Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Henrys Lake State Park. Public access is listed as yes.
Can I fish at Henry'S Lake @ Boat Ramp?
- Henry'S Lake @ Boat Ramp has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Idaho's fish and wildlife agency, so check its current regulations before you go.
Explore Henry'S Lake @ Boat Ramp across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX2 samples · 2018
Analytical methods
- Phosphorus by Single Reagent Colorimetry
- 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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory