Methodology

Primary sources

All data on this site is drawn from official documents: the Johnson County Sheriff's Office monthly control sheets, Iowa Department of Inspections, Appeals and Licensing jail inspection reports, Johnson County Board of Supervisors meeting minutes and agenda packets (accessed via the County's Granicus archive), Johnson County budget documents (FY24–FY27), and consultant reports obtained from the County's website or via open-records requests.

The Sheriff's Office publishes annual jail statistics in two formats: "Weekly Jail Statistics Summary" PDFs (FY15–FY20, with daily detail) and "Control Sheet" PDFs (FY21–present, with monthly summary). All ADP figures on this site are computed from these primary documents.

Column-swap warning (FY15 and FY16 source PDFs)

The "INMATES IN J.C. JAIL" and "HOUSED ELSEWHERE" column labels in the top summary table of the FY14FY15 and FY15FY16 Weekly Statistics Summary PDFs are reversed relative to the daily-detail tables that follow. Values used on this site are from the daily-detail legend, which is canonical. This is documented in the source manifest.

What "ADP" means on this site

"In-house ADP" means the average number of inmates physically present at 511 S. Capitol Street, Iowa City (the Johnson County Jail) per day, computed from the 6 a.m. location report or equivalent. "Total in-custody ADP" means in-house plus out-of-county housed prisoners plus electronic monitor participants, as reported in the Sheriff's control sheets.

The CSSI fact sheet figure of "86 ADP" is consistent with the calendar year 2024 ADP, calculated from FY2024 and FY2025 control sheets. The fact sheet itself does not specify how the number is calculated.

Open-records requests

Documents obtained via open-records requests are identified as such in source citations and tracked on the Records page. Originals are available for download where noted.

Inflation adjustment

Bond amounts in the history section are adjusted to 2026 dollars using the Turner Construction Cost Index (CCI), which is the industry-standard index for construction cost escalation and is the index cited in Shive-Hattery's own cost estimates.

Corrections log

No corrections to date.