# N05_E18 Great Lakes pilot: 1984 flow/water-quality survey and 1988 dredging-response bridge **Run date:** 2026-08-12 **Sector:** `N05_E18` — canonical 24 × 24 grid cell, 37.5–45.0° N and 75–90° W **Time band:** 1950–2000 historical bridge **Research status:** bounded finding; no sector score or `provisional_quadrant` assigned ## Selection and non-duplication decision This run continues the Great Lakes pilot at `N05_E18` and follows the next unresolved path identified in the 2026-08-12 source-ledger note: retrieve distinct primary or near-primary technical records for the 1984 flow/water-quality conditions and the 1988 sediment-management response. The two records below were not previously extracted as standalone project notes: - Charles G. Crawford and David J. Wangsness, *Streamflow and Water Quality of the Grand Calumet River, Lake County, Indiana, and Cook County, Illinois, October 1984*, U.S. Geological Survey Water-Resources Investigations Report 86-4208, published 1987. - Donald F. Hayes, T. Neil McLellan, and Clifford L. Truitt, *Demonstrations of Innovative and Conventional Dredging Equipment at Calumet Harbor, Illinois*, U.S. Army Engineer Waterways Experiment Station Miscellaneous Paper EL-88-1, February 1988, Internet Archive item `DTIC_ADA191064`. The 1984 USGS report overlaps the existing 1989/1991 reports’ discussion of effluent-dominated flow and nonpoint or unidentified inputs, but it adds a separate field survey with station-level methods, dates, units, and branch comparisons. The 1988 report adds a distinct experimental record on dredging and disposal equipment rather than repeating the 1989 sediment-impact synthesis. ## Search envelope and spatial crosswalk The USGS report covers sampling stations in the Grand Calumet River basin across Lake County, Indiana, and Cook County, Illinois. The Army report concerns Calumet Harbor, Illinois, in the larger Indiana Harbor dredging/disposal context. Both are subarea or reach/harbor records related to the southern Lake Michigan industrial corridor, not cell-wide samples. | Source footprint | Relationship to fixed cell | Confidence | Limitation | |---|---|---|---| | Grand Calumet River East and West Branches, Indiana Harbor Ship Canal vicinity, and associated stations | Local corridor within or adjacent to the human anchor area of `N05_E18` | high | Station locations and reach lengths were not georeferenced to the full cell in this run | | Calumet Harbor, Illinois, and dredging/disposal test area | Connected southern Lake Michigan harbor context, partly west/northwest of the Merrillville anchor | high | Harbor test footprint is not equivalent to `N05_E18`; cross-border/local study extent is retained | ## Raw observations ### A. 1984 USGS diel flow and water-quality survey **Source:** Crawford, Charles G., and David J. Wangsness. *Streamflow and Water Quality of the Grand Calumet River, Lake County, Indiana, and Cook County, Illinois, October 1984*. U.S. Geological Survey Water-Resources Investigations Report 86-4208, 1987. The report states that the field survey occurred October 3–4, 1984 and was prepared in cooperation with the Indiana State Board of Health. | Observation | Direct source result | Page provenance | Observation type | Confidence / limitation | |---|---|---|---|---| | Effluent-dominated flow | The abstract reports that industrial effluents comprised more than **90%** of the approximately **500 ft³/s** flow at the East Branch/Indiana Harbor Ship Canal confluence; virtually all West Branch flow was municipal effluent | PDF p. 1, abstract | Measured field survey summarized by authors | High for the report’s stated result; local reach and survey-period observation, not a cell-wide hydrologic fraction | | Diel flow variability | The abstract reports diel streamflow variations up to **300 ft³/s** near the ship canal, diminishing upstream; the West Branch showed drastic diel swings, including complete flow reversals near the ship canal | PDF p. 1, abstract; pp. 28–43, figures and discussion | Measured field observation | High; variations are survey-specific and should not be generalized to all seasons or years | | East Branch dissolved oxygen | Average dissolved oxygen in the East Branch ranged from **5.7 to 8.2 mg/L** across the sampled stations | PDF p. 1, abstract; water-quality tables beginning p. 40 | Measured field observation | High for the report’s station series; station footprint and sampling window are narrow | | West Branch standards exceedances | The abstract reports that West Branch water-quality standards were exceeded for total ammonia, chloride, cyanide, dissolved solids, fluoride, total phosphorus, mercury, and phenol; the East Branch exceeded standards only for total phosphorus and phenol in the report’s comparison | PDF p. 1, abstract; pp. 40–92 | Reported comparison against standards | High for the report’s stated comparison; applicable standards and station/date details require a separate standards crosswalk | | Unidentified inputs | Differences between cumulative effluent and in-stream chemical-mass discharges at multiple stations indicated unidentified waste inputs; the report specifically describes a possible untreated-sewage source between the Hammond wastewater-treatment plant and Columbia Avenue in the West Branch | PDF pp. 106–108, discussion of cumulative effluent and in-stream discharges | Derived by source authors from measured observations | Medium-high; the report presents this as an inference, not an identified facility | | Flow/source uncertainty | The report notes that streamflow near the ship canal could vary with Lake Michigan water levels and that mass-balance differences could reflect measurement or unmeasured-input issues | PDF pp. 28–43 and 106–108 | Technical limitation | High as a limitation statement; it prevents treating the mass discrepancy as a quantified undocumented discharge | **Units and extraction:** the report uses inch-pound units for flow (`ft³/s`) and reports water chemistry in `mg/L` or `µg/L` where applicable. No unit conversion or aggregation was performed in this run. The result is retained at the report’s station/date resolution. ### B. 1988 U.S. Army dredging and disposal demonstration **Source:** Hayes, Donald F., T. Neil McLellan, and Clifford L. Truitt. *Demonstrations of Innovative and Conventional Dredging Equipment at Calumet Harbor, Illinois*. U.S. Army Engineer Waterways Experiment Station, Environmental Laboratory, Miscellaneous Paper EL-88-1, February 1988. Internet Archive identifier `DTIC_ADA191064`. | Observation | Direct source result | Page provenance | Observation type | Confidence / limitation | |---|---|---|---|---| | Test purpose | The report describes field demonstrations at Calumet Harbor conducted within a larger evaluation of dredging and disposal options for contaminated material at Indiana Harbor | PDF documentation page and abstract continuation, unnumbered front matter | Report purpose and institutional context | High; the report is an Army technical test record, but the harbor demonstration is not the full Indiana Harbor system | | Equipment contrast | The report states that the clamshell dredge generated the largest suspended-sediment plume affecting the entire water column; cutterhead and matchbox dredges limited resuspension to the lower portion of the water column, with the cutterhead slightly outperforming the matchbox | PDF documentation-page abstract continuation; report §29, printed p. 26 | Experimental observation and author conclusion | High for the cited test; equipment operation, site conditions, and test configuration limit transferability | | Diffuser response | The report states that a submerged diffuser successfully limited sediment resuspension to the lower water column and significantly reduced discharge velocities | PDF documentation-page abstract continuation; diffuser test section | Experimental observation and author conclusion | High for the report result; no cell-wide sediment or water-quality effect is derived | | Near/far-field distinction | The report’s far-field discussion states that elevated suspended-solids concentrations were confined to the immediate vicinity of the dredging operation and that most far-field observations were at or near background, especially in the upper water column | Printed p. 26, §29 | Measured/test interpretation | Medium-high; “background” is the report’s local comparison, not a zero-impact claim for the harbor or cell | The Army report is a technical response record: it documents an attempt to reduce the environmental side effects of sediment removal. It does not establish that contamination had been removed, that the method was adopted throughout the corridor, or that the 1988 demonstration changed the fixed-cell condition. ## Source interpretation The two records narrow the historical bridge in a useful way: ```text industrial/municipal effluent-dominated flow → station-level diel and branch differences → unresolved non-permitted or unmeasured inputs → sediment-removal technology tested for resuspension control ``` The 1984 USGS survey supports a bounded observation that the Grand Calumet system’s hydrology and water quality were strongly shaped by engineered effluent and wastewater infrastructure rather than by a simple natural-drainage baseline. It also documents internal differentiation: East and West Branch conditions, flow reversals, and constituent-specific standards exceedances were not interchangeable. The 1988 Army demonstration adds an institutional-response observation: the environmental effects of dredging were experimentally compared and equipment choice mattered for sediment resuspension. This is evidence of technical learning or attempted adaptation in the harbor-management system, not a score for adaptive capacity. ## Derived observations and scores No Macro-Culture constraint, adaptive-capacity, energy, water, infrastructure, or population score was calculated. The following values remain source observations, not normalized indicators: - `>90%` and approximately `500 ft³/s` describe the 1984 survey’s East Branch/ship-canal flow condition. - `up to 300 ft³/s` describes observed diel streamflow variation near the ship canal during the survey. - `5.7–8.2 mg/L` describes East Branch dissolved oxygen across sampled stations during the survey. - The list of West Branch standards exceedances is a report-level comparison, not a composite water-quality score. - The equipment comparison describes local dredging-test behavior, not a regional remediation rate. **Formula version:** none applied. **Derived constraints:** not calculated. **Adaptive-capacity indicators:** not calculated. ## Model classification ```yaml sector_id: N05_E18 periods_touched: [1950-2000] provisional_quadrant: unresolved reason: observations are reach- and harbor-specific; the field surveys do not provide cell-wide denominators or a fixed formula; source conditions and standards require additional crosswalks ``` `provisional_quadrant` is a model output, not an archival fact. This run assigns none. ## Confidence and missingness - **Source authority:** high for the USGS and Army reports as institutional technical records and for the cited page-level observations. - **Geographic fit:** high for the Grand Calumet/Calumet Harbor corridor; medium for the relationship to the full mixed land/water `N05_E18` cell. - **Temporal fit:** high for the 1984 survey and 1988 report dates; medium for using them as a 1950–2000 band bridge. - **Measurement quality:** high for reported station methods and experimental observations; mixed where the reports summarize or infer unknown sources. - **Extraction quality:** high for the USGS PDF text and page anchors; high for the Army PDF/Archive.org OCR and documentation-page abstract, with the OCR used as a locator and the PDF page/section retained. - **Independent corroboration:** medium. The records are distinct from, and broadly compatible with, the 1989/1991 reports, but the underlying HydroQual WLA and all station maps were not independently reconstructed here. - **Comparability:** related but not equivalent to modern WQP/USGS/EPA records until analytes, standards, stations, methods, periods, and footprints are harmonized. - **Known bias:** both records are technical agency studies with operational purposes; the Army report evaluates equipment performance and should not be read as a neutral regional environmental inventory. Explicit missingness: - `project_footprint_not_cellwide`: both records concern local reaches, stations, or harbor test areas. - `historical_series_not_reconstructed`: no continuous 1950–2000 flow or water-quality series was built. - `geographic_match_uncertain`: station and harbor coordinates were not intersected with the canonical cell envelope. - `period_match_uncertain`: 1984 and 1988 anchors do not represent the full 1950–2000 band. - `standards_crosswalk_missing`: the applicable historical standards and revision dates were not fully reconstructed. - `source_lineage_partial`: the USGS survey and Army test are primary technical records, but references to other studies and the relation to HydroQual’s WLA remain incompletely traced. - `historical_dmr_not_reconstructed`: no 1970–2000 facility/outfall DMR series was downloaded or parsed. - `hydrodynamic_transport_not_cellwide`: the report’s flow and sediment observations do not quantify whole-cell transport or storage. - `not_applicable`: no score and no quadrant. Archival silence, absent station rows, unlocated reports, and non-cell footprints are not converted into zero or absence. ## Falsification and alternative explanations The observations do not establish that the regular grid cell caused the observed water-quality or industrial pattern. Engineered water withdrawal, wastewater outfalls, industrial process design, municipal sewer topology, lake-level forcing, measurement timing, regulatory standards, and corporate or public works decisions may explain much of the observed system behavior. The equipment result also has an important boundary: a dredge that produced a smaller local plume under test conditions is not automatically a successful regional remediation strategy. A later analysis must test adoption, sediment fate, contaminant concentrations, and long-term beneficial-use outcomes. ## Next search path 1. Retrieve and inspect the full HydroQual 1984 *Grand Calumet River Wasteload Allocation Study and Appendix*. EPA NEPIS literature-search records identify it as reference `035BOH` and link it to the Indiana State Board of Health/Division of Water Pollution Control, but the primary report itself was not obtained in this run. 2. Retrieve the EPA 1985 *Master Plan for Improving Water Quality in the Grand Calumet River–Indiana Harbor Canal* and the 1974 Snow/IIT Research Institute *Water Pollution Investigation: Calumet Area of Lake Michigan*; use the reports’ original tables and pages rather than secondary summaries. 3. Retrieve the 1985–1987 USGS and Indiana fixed-station/monitoring records, then crosswalk station coordinates and standards versions. 4. Download the relevant EPA ICIS-NPDES DMR/permit fiscal-year files for Gary `IN0022977`, Hammond `IN0023060`, and East Chicago `IN0022829`; preserve outfalls, monitoring locations, pollutants, units, results, limits, reporting periods, and NODI codes before aggregating. 5. Georeference the USGS station map, Army harbor test area, and 1989/1991 report maps against the fixed `N05_E18` envelope; retain reach/harbor footprints separately. 6. Compare the 1984/1988 records with WQP/NWIS observations only after documenting variable, unit, method, date, and footprint relationships. 7. Continue the nine-sector Great Lakes pilot before any formula lock or quadrant assignment. ## Provenance register 1. **Crawford, Charles G., and David J. Wangsness.** *Streamflow and Water Quality of the Grand Calumet River, Lake County, Indiana, and Cook County, Illinois, October 1984*. U.S. Geological Survey Water-Resources Investigations Report 86-4208, 1987. PDF pages 1, 28–43, and 106–108 used above; accessed 2026-08-12. 2. **USGS report PDF derivative.** *WRI 86-4208*, 148-page PDF, page anchors above. 3. **Hayes, Donald F., T. Neil McLellan, and Clifford L. Truitt.** *Demonstrations of Innovative and Conventional Dredging Equipment at Calumet Harbor, Illinois*. U.S. Army Engineer Waterways Experiment Station, Miscellaneous Paper EL-88-1, February 1988. Internet Archive item `DTIC_ADA191064`; documentation-page abstract and printed p. 26 used above; accessed 2026-08-12. 4. **Army report PDF derivative.** Exact downloadable item derivative used for verification: `DTIC_ADA191064.pdf`. 5. **EPA NEPIS literature search, indexed by year.** Record for the 1984 HydroQual Grand Calumet Wasteload Allocation Study, reference `035BOH`; discovery lead only, not substituted for the primary report. 6. **EPA NEPIS.** *Master Plan for Improving Water Quality in the Grand Calumet River–Indiana Harbor Canal*, discovery record `200075QV`; discovery/interpretation lead only in this run, not substituted for full primary extraction. 7. **EPA NEPIS.** Snow/IIT Research Institute *Water Pollution Investigation: Calumet Area of Lake Michigan*, discovery record `20009QZS`; discovery lead only in this run. 8. **EPA ECHO.** ICIS-NPDES DMR/permit data documentation used to define the next machine-readable retrieval path. 9. **Prior project report.** Brannon et al., 1989, *Analyses of Impacts of Bottom Sediments from Grand Calumet River and Indiana Harbor Canal on Water Quality*, Internet Archive item `DTIC_ADA206507`; used for non-duplication and cross-source context. 10. **Project SOP.** Fixed 24 × 24 geometry, provenance, comparability, missingness, and quadrant boundary: `08-research-sop.md`. ## Bottom line The page-verified 1984 USGS survey adds a distinct historical observation for `N05_E18`: during the October 3–4, 1984 survey, the Grand Calumet system was strongly shaped by industrial and municipal effluent, with large diel flow changes, branch-specific dissolved-oxygen and standards conditions, flow reversals, and unresolved differences between known effluent and in-stream chemical mass. The 1988 Army report adds a distinct response observation: dredging equipment and a submerged diffuser produced different local sediment-resuspension behavior, with some configurations limiting resuspension under the tested conditions. These findings strengthen the historical bridge for a subarea of `N05_E18` and show both infrastructural constraint and attempted technical response. They do not justify a cell-wide score, a causal claim about the fixed grid, or a `provisional_quadrant`. The formula and quadrant remain **unresolved**.