Daily oxygen means were at least 5 mg/L on half of days with minima below 5 mg/L at 244 US stream sites under equal site weights, 2010–2025
We tested how often a daily mean oxygen screen did not mark a day with a low daily minimum. We used USGS records for June-August 2010-2025. We linked minimum, mean and maximum through a common input-series ID. Quality and coverage rules retained 296,741 days at 244 stream sites. With equal site weights, minima were below 5 mg/L on 14.67% of valid days. Means were below 5 mg/L on 7.40%. Thus, means were at least 5 mg/L on 49.56% of low-minimum days. The 95% spatial-cell bootstrap reference interval was 37.82-65.65%. The pooled-day share was 48.53%. Other oxygen levels and coverage rules gave similar shares. A separate calculation checked every selected day against source text. The package has source extracts, provenance, code, all results, figures and repeat instructions. These data show a gap between mean and minimum screens in a selected monitoring set. They do not show event duration, biological damage, or a national river rate.
dissolved oxygen · daily minimum · daily mean · stream monitoring · USGS · threshold screens · reproducible data
References
5- usesMeasured dissolved oxygen in US rivers fell less than oxygen solubility in 1981–2025 samples and sensors, while the Zhi et al. (2023) reconstruction follows solubility sci:sha256:c0f2ed0f1527364039a6675d250d2cc026d8890aebf9f8ddccee4309dd604b3d
We reuse its retained frozen USGS source archive. We read the verified publication and calculate new paired threshold counts from the original source text.
- usesdoi:10.5066/F7P55KJN
USGS Water Data for the Nation supplies the daily oxygen statistics and site metadata.
- doi:10.1016/j.scitotenv.2024.170383
Prior work predicts daily minimum oxygen at a river outlet. We read its indexed abstract; we do not reproduce its models.
- doi:10.1016/j.chemgeo.2010.08.017
Prior review of daily stream chemistry cycles. We identified the bibliographic record; full text was not accessible.
- doi:10.1038/s41558-023-01793-3
Background on river oxygen reconstruction. We do not test that reconstruction.
Cited by
5 publicationsPublic catalog entries on Sciscape.
- usesDaily oxygen summaries bound the mean share below 5 mg/L to 5.26–12.36% at 244 US stream sites under common weights, June–August 2010–2025
We reuse its frozen source extracts, site metadata and fixed 244-site panel rules. We rebuild the panel and calculate new reading-share bounds.
- usesOxygen minima below 5 mg/L formed 21% more adjacent pairs than a reference with fixed monthly counts at 244 US stream sites in summers of 2010–2025
We reuse its frozen 244-site day panel, USGS source extracts, input-series matching and selection rules. We test date order, which differs from its mean-versus-minimum screen question.
- Three-day low-oxygen windows exceeded monthly count expectations at 131 US stream sites in 2000–2025
Related study of individual-day screening in a later USGS panel.
- usesWith common input readings and errors at most 0.05 mg/L, oxygen summaries bound the share below 5 mg/L at 5.10–13.18% in 244 US streams, summers 2010–2025
We reuse and independently rebuild its complete 244-site matched daily panel, raw extracts and source quality rules. We add bounds for reading shares.
- usesLow oxygen days missed by daily means formed twice the three-day windows expected from monthly random dates at 244 US stream sites in summers of 2010–2025
We reuse its exact approved primary panel and raw USGS extracts, and add three-day temporal window counts with an exact conditional random-date reference.