South Dakota reservoir · state assessment record
Lake Drywood North
The assessment record reported by South Dakota to EPA under Clean Water Act sections 303(d) and 305(b), filed in the 2014 reporting cycle.
- 912
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Lake Drywood North, a reservoir in South Dakota, was reported but not assessed in the state's most recent Integrated Report cycle (2014). By assessed acreage it sits among the largest 10% by assessed acreage nationally (38,628 lakes).
- Not Assessed
- overall status
- P94
- Assessed size nationally
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
Lake Drywood North against the ATTAINS register
Paragraphs are selected by this unit's percentiles and use matrix: different lakes lead with different dimensions. Figures are ATTAINS / portal register arithmetic, not advice.
The signature stat: monitoring lag
Monitoring and cycle are aligned here: evidence through 2020 against reporting cycle 2014. Currency is not the unusual fact on this record.
Large assessed unit
At 911.6 acres, Lake Drywood North clears the upper tercile of assessed lake-type units with an area on file (2,419 still larger). Size comparisons use the portal's deduplicated lake ranking population, not raw ATTAINS row counts.
IR category 3 on Lake Drywood North
The Integrated Report category filed for Lake Drywood North is 3. PlainLakes renders EPA's code without remapping it into a consumer grade.
Overall status: Not Assessed
ATTAINS overall status on this unit is “Not Assessed”. PlainLakes does not rewrite that vocabulary into a consumer score.
According to the U.S. Environmental Protection Agency's ATTAINS program, South Dakota carries 195 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Lake Drywood North without modification. See our methodology for reporting-unit limits and gauge linking rules.
The record
Designated-use assessments
Fully Supporting and Not Supporting are the state's definitive verdicts; other entries mean the use was not conclusively assessed in this cycle. South Dakota filed 2020 as the year this waterbody was last monitored.
| Designated use | Group | Verdict |
|---|---|---|
| Fish and Wildlife Propagation, Recreation, and Stock Watering Waters | Aquatic-life or related | Insufficient Information Filer confidence: Low |
| Immersion Recreation Waters | Recreation | Insufficient Information |
| Limited Contact Recreation Waters | Recreation | Insufficient Information |
| Warmwater Marginal Fish Life Propagation Waters | Aquatic-life or related | Insufficient Information Filer confidence: Low |
The record
Listed impairment causes
The state reported this reservoir in its 2014 Integrated Report cycle but reached no assessment determination, so no causes are listed. The unit is recorded under EPA integrated-reporting Category 3: reviewed, with insufficient information to determine whether it meets water-quality standards. An undetermined waterbody is neither confirmed clean nor confirmed impaired.
Reading the record
What Lake Drywood North's record holds
Scale and rank
Lake Drywood North is one of 195 lake-type waterbodies reported to EPA from South Dakota. It is not among the 176 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 912 assessed acres it ranks 2,420th by assessed size among the 38,628 lakes the dataset carries an area for, counting a state’s repeated filings of one water once, behind 2,419 lakes with a larger one.
What this record holds
South Dakota filed this reservoir in its 2014 Integrated Report cycle but reached no determination, so the record holds that filing and its use rows, but no verdict, and with nothing judged, no impairment cause to track over time. The state has not yet filed a definitive fish-consumption verdict, a definitive recreation verdict, a definitive aquatic-life verdict, and 1 other for this record; those fields populate when it reports them in a future Integrated Report cycle.
Reported trophic class
South Dakota carried the trophic field for this assessment unit and filed it as unclassified, which records that no class was determined rather than that the water is unenriched. What the trophic scale measures.
In context
Where Lake Drywood North sits nationally
Assessed size among U.S. lakes
Distribution of assessed acreage across ATTAINS lakes filed with an area, counting a state’s repeated filings of one water once
912 Top 6% larger than 94% of 38,628 lakes
lakes the dataset carries an area for, counting a state’s repeated filings of one water once, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
In both charts each bar is a band and taller bars hold more waterbodies; the dashed line and filled bar mark Lake Drywood North. Hover or tap any bar for its full count and share.
In context
South Dakota context
ATTAINS carries 195 lake-type waterbodies in South Dakota, 145 assessed as not supporting at least one use and 41 fully supporting.
| Other large assessed lakes in South Dakota | Assessed acres |
|---|---|
| Lake Thompson Not Supporting | 13,888 |
| Lake Poinsett Not Supporting | 9,795 |
| Waubay Lake Not Supporting | 9,531 |
| Bitter Lake Not Supporting | 7,865 |
| Dry Lake Number 2 Not Supporting | 6,442 |
| Orman Dam (Belle Fourche Reservoir) Not Supporting | 6,106 |
Lakes near Lake Drywood North's assessed acres
Similar assessed acres
Nearest filed extents (912 acres here).
- Cedar Lake · 913 acres · MI
- East Branch Penobscot River (2) · 913 acres · ME
- Lake Down · 910 acres · FL
- Cheesman Reservoir · 909 acres · CO
What to do with this record
- Assessment verdicts are cycle-based, not real-time. For fish-consumption decisions, your state advisory program is the binding source. Consumption status guide
- Impairment listings follow the Clean Water Act 303(d) process; a listing is a regulatory finding, not a closure notice. 303(d) explained
PlainLakes renders state assessment decisions and federal gauge observations without modification. It does not issue advisories.
Assessment decisions on this page are rendered directly from state Integrated Report records in EPA's ATTAINS system; gauge figures are daily-value observations from the USGS National Water Information System, no number is typed in by an editor. Overall status, use verdicts, and causes are the state's reported decisions for assessment unit SD-MN-L-DRYWOOD_NORTH_01. Counts and percentiles are computed across all lake-type records PlainLakes ingests from ATTAINS. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-17. Primary sources: EPA ATTAINS and USGS National Water Information System.