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Submitted civil engineering record
An October 2025 mass-grading plan set shows the proposed SBN520 layout, planned disturbance, mapped wetlands and stormwater controls. Current site work and future building construction are tracked separately from what those submitted drawings proposed.
Construction status — July 26, 2026
This status combines a dated Northshore Gen field observation with public project statements. “Under construction” does not mean the data-center buildings are complete or operating.
Northshore Gen reports that mass-grading work is visibly underway as of July 26, 2026. That observation is consistent with the submitted grading plans and Merrillville’s official description of the Hobart campus as currently under construction.
This establishes active site preparation—not completed buildings and not proof that every planned environmental control is performing as designed.
Northshore Gen reports that vertical construction is scheduled for late 2026. A January 2026 update from Hobart’s mayor also tied a city payment to the first building going vertical and described 2026 as the expected construction year.
The late-2026 timing remains a schedule. It can change with permits, site readiness, weather and contractor sequencing.
City stormwater technical review
On October 21, 2025, Wessler Engineering, reviewing on behalf of the City of Hobart, marked the third construction/SWPPP submittal adequate for the minimum City stormwater and IDEM construction- stormwater requirements.
The review covers the Hobart Data Center Campus mass-grading plan at 4751 E. 61st Avenue. It marks plan elements for wetlands, buffers, grading, drainage, dewatering, spill response, stabilization and long-term maintenance as adequate.
The form directs the applicant to submit a Notice of Intent through IDEM’s regulatory portal.
The review says it evaluates the completeness of the construction stormwater plan and does not cover every other local, state or federal permit. It also warns that construction and weather can require changes.
“Adequate plan” does not prove every control has been installed, maintained or independently verified in the field.
Submitted SBN520 plan facts
Drawn on the submitted SBN520 general-grading sheet.
Anticipated in the submitted mass-grading plan.
Prepared for the 4751 E. 61st Avenue campus parcel.
Document boundary: This is a submitted civil plan set. It is not Amazon’s air-permit application, an IDEM-issued air permit, a final building approval, a legal survey or proof that the proposed controls have been built and are working.
What the drawings show
| Topic | Finding | Where to verify |
|---|---|---|
| Planned disturbance | The stormwater plan describes approximately 115 acres of anticipated mass-grading disturbance. | Plan p. 25, sheet C-033 |
| Future building pads | The general grading sheet draws six areas labeled “Future Building Pad” on the SBN520 parcel. | Plan p. 28, sheet C-070 |
| Wetland context | The drawings identify wetland limits, show 60-foot wetland buffers in mapped areas and include a constructed wetland with forebays and a micropool. | Plan pp. 28 and 31, sheets C-070 and C-070.3 |
| Stormwater design | The submitted design uses vegetated swales, constructed wetlands, erosion controls and sediment-control measures. | Plan p. 25, sheet C-033 |
| Inspection and stabilization | The plan calls for at least weekly inspections, additional rain-event inspections and stabilization deadlines for inactive disturbed areas. | Plan p. 25, sheet C-033 |
| Floodplain setting | The plan identifies Zone AE and floodway conditions on the eastern portion and describes drainage toward Sprout Ditch and Deep River. | Plan pp. 25 and 31, sheets C-033 and C-070.3 |
Supported by this record
Not established by this record
Review the source
A complete 39-page, web-optimized copy of the submitted civil plan set for the SBN520 parcel showing proposed mass grading, six future building pads, approximately 115 acres of disturbance, stormwater controls and mapped wetland/floodplain boundaries. Page content is preserved while image resolution is reduced for public web viewing. It is not an air permit, a final building approval or proof that the work is complete.
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