Nebraska lake · state assessment record
Tree Claim Lake (Crescent Lake NWR)
Assessment decisions reported by Nebraska to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2016 reporting cycle.
- 6.00
- Assessed acres
- Lake, Freshwater
- Water type
This waterbody in one line
Tree Claim Lake (Crescent Lake NWR), a lake in Nebraska, is assessed as not supporting one or more designated uses, with one listed impairment cause in the state's most recent Integrated Report cycle (2016). By assessed acreage it sits among the smaller assessed lakes nationally (38,628 lakes with a filed area); its impairment list is among the longest nationally (one listed cause vs 23,610 assessed lakes). Aquatic life is assessed as fully supporting.
- Not Supporting
- overall status
- P12
- 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.
How Tree Claim Lake (Crescent Lake NWR) reads against 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
What stands out first is how small the assessed unit is: 6 acres, smaller than 88% of the 38,628 lake-type units carrying an area.
Tree Claim Lake (Crescent Lake NWR): Category 4C reading
Category 4C marks impairment from pollution that is not a pollutant (for example habitat or flow alteration) on Tree Claim Lake (Crescent Lake NWR). A classic TMDL load model often does not apply; the cause list should name the non-pollutant stressor.
Every ruled-on use is fully supporting
The filed use determinations for aquatic life are all Fully Supporting. Where an overall IR category still flags the unit, look at the cause list and report standing rather than treating the use row as empty.
Overall status: not supporting
The filer's overall status for Tree Claim Lake (Crescent Lake NWR) 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, Nebraska carries 554 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Tree Claim Lake (Crescent Lake NWR) 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 |
|---|---|---|
| Aesthetics | Other | Fully Supporting |
| Agricultural Water Supply | Other | Not Supporting |
| Aquatic Life | Aquatic-life or related | Fully Supporting |
| Primary Contact Recreation | Recreation | Not Assessed |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this lake, with the cycle each was first listed. None is a pollutant, so none carries a TMDL cleanup plan.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Specific Conductivity | Agricultural Water Supply | 2008 | Not applicable (non-pollutant) |
Reading the record
Tree Claim Lake (Crescent Lake NWR): Category 4C reading
4C Category 4C: impaired by a non-pollutant; TMDL programme does not apply
Nebraska filed this assessment unit as Category 4C: the impairment is not caused by a pollutant, so the Clean Water Act 303(d) cleanup-plan (TMDL) programme, which allocates pollutant loads, does not apply here.
A 4C listing is still an impairment finding about designated uses; it is not a clean bill of health. How listing and cleanup work.
Scale and rank
Tree Claim Lake (Crescent Lake NWR) is one of 554 lake-type waterbodies reported to EPA from Nebraska, and one of 250 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 6.00 assessed acres it ranks 33,743rd 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 33,742 lakes with a larger one.
Awaiting a filing
The state has not yet filed a definitive fish-consumption verdict and a definitive recreation verdict for this record; those fields populate when it reports them in a future Integrated Report cycle.
In context
Where Tree Claim Lake (Crescent Lake NWR) 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
6 Top 88% larger than 12% 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 Tree Claim Lake (Crescent Lake NWR). Hover or tap any bar for its full count and share.
In context
Nebraska context
ATTAINS carries 554 lake-type waterbodies in Nebraska, 219 assessed as not supporting at least one use and 138 fully supporting. Among the 250 indexed units there, Tree Claim Lake (Crescent Lake NWR) ranks 194th by listed-cause count (one listed cause) and 201st by assessed size among the 247 with an area filed; it sits in the not-supporting set (219 statewide) . Its listed causes (Specific Conductivity) sit outside Nebraska's top-five list, which is led by Mercury in Fish Tissue.
| Other large assessed lakes in Nebraska | Assessed acres |
|---|---|
| Lewis and Clark Lake Not Supporting | 25,174 |
| Lake C. W. McConaughy Fully Supporting | 24,868 |
| Harlan County Reservoir Not Supporting | 12,821 |
| Calamus Reservoir Not Supporting | 5,028 |
| Swanson Reservoir Not Supporting | 4,660 |
| Sutherland Reservoir Fully Supporting | 2,954 |
Peers near Tree Claim Lake (Crescent Lake NWR)'s size or cause load
Similar assessed acres
Nearest filed extents (6.00 acres here).
- Acorn · 6.00 acres · IL
- Allen Lake · 6.00 acres · IN
- Androscoggin River (6) above Little Androscoggin · 6.00 acres · ME
- Arnold Lake · 6.00 acres · IN
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
- Abbotts Creek (including Lexington-Thomasville Water Supply Reservoir at normal reservoir elevation, Tom-A-Lex Lake) · 1 causes · NC
- Abeniki Lake · 1 causes · NH
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 NE-NP2-L0270. 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.