Lyman Reservoir
Apache County, Arizona1,324 acresView mapDirections
No nutrient or algae sampling on record from ADEQ for this lake.
- Impaired · Mercury
- Public access
- Limited data
Lyman Reservoir in Apache County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 1324 acres.
Lyman Reservoir is a 1,324-acre lake in Apache County, Arizona. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-03-22. Methodology: how these readings are compared.
What Lyman Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water1,324 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Lyman Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Lyman Reservoir is safe to swim in today is a call for the Arizona Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lyman Reservoir
These are the measurements ADEQ publishes for Lyman Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Lyman Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
1,324 acres
Public access
Yes
Listed by ADEQ
No bathymetric survey has been published for Lyman Reservoir, so its depth is not documented here.
Recreation & Access
- Lyman LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Lyman Reservoir
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Fishing Lyman Reservoir
Water quality readings over time
3 seasons of samples on record (2012–2018). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving3 years
Phosphorus
Improving-18.7 µg/L/yr3 years
Chlorophyll-a
Improving-0.74 µg/L/yr2 years
Reservoir Info (USACE NID)
Lyman Reservoir is a man-made reservoir impounded by the Lyman Dam (completed 1912), built primarily for irrigation on the Little Colorado River; rockfill-type dam, 60 ft tall and 800 ft long.
- Surface area
- 1,324 ac
- Normal storage
- 30,600 ac-ft
- Max storage
- 44,500 ac-ft
- Drainage area
- 790 sq mi
- Hazard class
- High
- Owner
- ARIZONA STATE PARKS;GROVERS HILL IRRIGATION DISTRICT
All listed purposes: Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ00004 · Operator website
EPA Impairment Status
Lyman Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit AZL15020001-0850_00 · Official waterbody report
Nearby Lakes in Apache County
Frequently asked questions about Lyman Reservoir
Where is Lyman Reservoir?
- Lyman Reservoir is a lake in Apache County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Lyman Reservoir?
- Lyman Reservoir in Apache County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 1324 acres.
Is Lyman Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lyman Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Are there boat ramps on Lyman Reservoir?
- Lyman Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lyman Lake. Public access is listed as yes.
Can I fish at Lyman Reservoir?
- Lyman Reservoir 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 Arizona's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
3 measurements from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC3 samples · 2026
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
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
Named boat-access points from the USGS National Boat Ramps inventory