North Carolina reservoir · state assessment record
Walnut Creek (Lake Johnson)
Assessment decisions reported by N.C. Dept. of Environmental Quality to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2022 reporting cycle.
- 148
- Assessed acres
- Reservoir
- Water type
This waterbody in one line
Walnut Creek (Lake Johnson), a reservoir in North Carolina, is assessed as not supporting one or more designated uses, with one listed impairment cause in the state's most recent Integrated Report cycle (2022). By assessed acreage it sits in the upper quartile by assessed acreage nationally (38,628 lakes); its impairment list is among the longest nationally (one listed cause vs 23,610 assessed lakes). Aquatic life is assessed as fully supporting. Fish consumption is assessed as not supporting.
- Not Supporting
- overall status
- P77
- Assessed size nationally
- P20
- Shorter cause list
- Fully Supporting
- aquatic life
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
A composite of this record's EPA ATTAINS designated-use verdicts, filed impairment count, and assessment currency, weighted and benchmarked against the national corpus of assessed active waterbodies. This is a water-quality standing, not a human-recreation or property-value judgment, and dimensions with no filed verdict drop out rather than count against the score.
Where Walnut Creek (Lake Johnson) stands in the filed 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: assessed size
The number that most separates Walnut Creek (Lake Johnson) nationally is assessed size: 148.3 acres, larger than 77% of the 38,628 lake-type units with an area on file.
The uses disagree
This record splits: Not Supporting on fish consumption, Fully Supporting on aquatic life. The divergence is inside the designated-use matrix, not a single all-or-nothing label.
Walnut Creek (Lake Johnson): Category 5A, TMDL still owed
Category 5A is the Integrated Report band where a TMDL (or equivalent) is still expected for Walnut Creek (Lake Johnson). Read the listed causes and any cleanup actions filed beside them before treating the overall status tile as a finished restoration story.
Overall status: not supporting
The filer's overall status for Walnut Creek (Lake Johnson) is Not Supporting. That tile summarizes the assessment unit; the designated-use rows and cause list are the evidence behind it.
Typical cause-list length
1 listed cause is a middle-tercile list length among assessed lake-type units. Look to IR category and use outcomes for the distinctive reading.
According to the U.S. Environmental Protection Agency's ATTAINS program, North Carolina carries 299 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Walnut Creek (Lake Johnson) 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.
| Designated use | Group | Verdict |
|---|---|---|
| Aquatic Life | Aquatic-life or related | Fully Supporting |
| Fish Consumption | Fish-consumption or fishery | Not Supporting |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this reservoir, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| PCBs - Fish Consumption Advisory | Fish Consumption | 2010 | Advance Restoration Plan (ARP) |
Reading the record
Where Walnut Creek (Lake Johnson) sits among peers
57% of North Carolina's lakes assessed this deeply also came out mixed
North Carolina ruled definitively on 2 designated uses at Walnut Creek (Lake Johnson) and found 1 of 2 not supported. The dataset shows 49 North Carolina lakes judged to that same depth.
North Carolina's assessed lakes are most often judged on 1 use; this one was judged on 2.
Computed share from EPA ATTAINS filed records, not an official EPA rating or safety grade.
| 1 | 2 | 3 | 4 | 5+ | |
|---|---|---|---|---|---|
| All supported | 50 | 12 | 0 | 0 | 0 |
| Mixed | Not possible | 28 (this record) | 8 | 1 | 0 |
| None supported | 44 | 9 | 0 | 0 | 0 |
Ringed cell: Walnut Creek (Lake Johnson). Source: EPA ATTAINS, Reporting cycles 1987–2026.
Scale and rank
Walnut Creek (Lake Johnson) is one of 299 lake-type waterbodies reported to EPA from North Carolina, and one of 92 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 148 assessed acres it ranks 8,987th 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 8,986 lakes with a larger one.
Awaiting a filing
The state has not yet filed a definitive recreation verdict for this record; that field populates when it reports it in a future Integrated Report cycle.
In context
Where Walnut Creek (Lake Johnson) 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
148 Top 23% larger than 77% 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
Listed causes vs waterbodies carrying a verdict
How many impairment causes U.S. waterbodies with a reported verdict carry
1 Longer than most more listed causes than 49% of 23,610 waterbodies carrying a verdict
named waterbodies carrying a verdict, 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 Walnut Creek (Lake Johnson). Hover or tap any bar for its full count and share.
In context
North Carolina context
ATTAINS carries 299 lake-type waterbodies in North Carolina, 90 assessed as not supporting at least one use and 62 fully supporting. Among the 92 indexed units there, Walnut Creek (Lake Johnson) ranks 70th by listed-cause count (one listed cause) and 65th by assessed size among the 91 with an area filed; it sits in the not-supporting set (90 statewide) . Its listed causes include PCBs - Fish Consumption Advisory, which also appears among North Carolina's most-filed impairment causes (led by Chlorophyll-a - Aquatic Life Use Support).
| Other large assessed lakes in North Carolina | Assessed acres |
|---|---|
| CATAWBA RIVER (Lake Norman below elevation 760) Not Supporting | 31,332 |
| Phelps Lake Fully Supporting | 15,938 |
| Albemarle Sound Not Supporting | 15,600 |
| Nutbush Creek Arm of John H. Kerr Reservoir (below normal pool elevation 300 feet MSL or as this elevation may be adjusted by the Corps of Engineers) Fully Supporting | 9,690 |
| Lake Waccamaw Fully Supporting | 8,840 |
| ROANOKE RIVER (Lake Gaston below normal full power pool elevation 200 MSL) Fully Supporting | 7,965 |
Peers near Walnut Creek (Lake Johnson)'s size or cause load
Similar assessed acres
Nearest filed extents (148 acres here).
- Pike Lake · 148 acres · WI
- Webster Stream - Locke Lake · 148 acres · NH
- Rainbow Lake · 148 acres · WI
- Otto · 148 acres · MN
Similar cause load
Nearest listed-cause counts (1 here). Peers already in the acreage column are omitted.
- Aaron · 1 causes · MN
- Aaron River Reservoir · 1 causes · MA
- Abeniki Lake · 1 causes · NH
- Academy Brook II Dam · 1 causes · NH
What to do with this record
- The fish-consumption use is assessed as not supporting. Before eating fish from this reservoir, check your state fish-advisory program for species-specific meal limits. 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 NC27-34-(1.5). 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.