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What this analysis covers, and what the data shows
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1
This dashboard examines the two variables that determine jail average daily population: booking rate and average length of stay.
Both booking rate and ALOS are affected by multiple factors, arrest practices, court processing speed, behavioral health capacity, diversion programs, and more. This dashboard presents the 2025 Whatcom County Sheriff's Office (WCSO) data and published corrections planning research on each variable.
2
Two empirical questions about "book-and-release" individuals: at what rate do they return, and what is the current crime trend?
The 2025 data shows approximately 80% of individuals whose bookings involve only charges associated with quick release did not return for any booking that year. The same-day return rate is about 0.1%. Washington National Incident-Based Reporting System (NIBRS) data shows reported crime offenses fell in major Whatcom County jurisdictions in 2024.
3
The dashboard also examines the current booking restriction system and what the Vera Institute's 2017 analysis of Whatcom County concluded.
The booking restriction policy in effect since February 2025 is population-triggered. The 2017 Vera Institute report examined Whatcom County's jail use patterns and made recommendations about diversion and system investment. Both are presented here so readers can examine the data in context of those frameworks.
Corrections Planning · Jail Population Drivers · Whatcom County 2025

What drives jail size -
and what shapes it.

Corrections planning is built around two variables: how many people enter the facility per day (booking rate) and how long each person stays (average length of stay). Both variables are influenced by a range of factors including arrest practices, court processing capacity, behavioral health services, and diversion programs. This dashboard examines those variables in Whatcom County's 2025 booking data and the published research on what affects each.

ADP × ALOS
the two variables that determine jail size
~81%
of 2025 bookings were pretrial
80%
of quick-release individuals did not return
Courts
case processing time directly drives ADP
74%
of booking surge driven by warrants, Department of Corrections (DOC) detainers, drug charges
Operational Context
The Operational Context, What Law Enforcement Is Managing
Acknowledgment
Whatcom County's law enforcement and corrections staff have been managing a documented capacity problem under constrained resources.
The booking restriction system isn't something anyone wanted. It represents Sheriff Tanksley, Chief Corrections Deputy Erickson, and line officers across every Interlocal Agreement (ILA) city department having to make difficult decisions daily, which calls get a full booking, which get a referral, how to manage a facility operating near its threshold while still protecting public safety. That is skilled, professional management under difficult constraints, not a failure. The question this dashboard asks is: what measurably reduces the underlying mismatch, so they don't have to manage the impossible indefinitely? The answer involves the full justice system, not just the jail.
The Fundamentals
Two Variables Determine How Large a Jail Needs to Be
The Equation Every Corrections Planner Uses Jail size is not determined by booking volume alone. It is determined by Average Daily Population (ADP), how many people are in the facility on any given day. ADP is the product of two variables: how many people arrive (booking rate) and how long each person stays (Average Length of Stay, or ALOS). A high booking rate with fast throughput produces a smaller average population. A moderate booking rate with slow case processing produces an overflowing one. Both variables are shaped by policy, system resources, and community conditions.
The fundamental equation of jail planning, used by corrections planners nationwide
ADP
Avg Daily Population
This is what determines jail size
=
Booking Rate
arrivals per day
Shaped by: crime rate, diversion programs, policy-driven charges (SB 5536, DOC detainers), warrant accumulation
×
ALOS
Avg Length of Stay
Shaped by: case complexity, court capacity, public defender workload, prosecutor resources, behavioral health needs
Prosecutors are right that serious cases drive long holds, those cases have high ALOS and legitimately inflate ADP. They are also right that these cases require appropriate pretrial detention. The path to reducing ADP without releasing dangerous people is to move the entire pretrial population faster, which requires investing in courts, defenders, and prosecutors alongside the facility.
2025 Data · Chuckanut Health Foundation analysis
What's Driving Booking Volume, 2025
Top arrest types · 2025 booking composition by category

Source: WCSO Booking Data 2025. Analysis: Chuckanut Health Foundation. Deduplicated on BookingNumber.

2025 Data · Chuckanut Health Foundation analysis
How 2025 Bookings Resolved, Disposition
~81% pretrial · 19.4% sentenced · 2.4% actual book-and-release notation

Source: WCSO Booking Data 2025. Pretrial includes bail bond and personal recognizance dispositions.

A Common Question
Incarceration Length, Deterrence, and the Evidence on What Changes Behavior
Pretrial Population
~81% of Bookings Are Pretrial, Case Processing Time Is a Jail Management Tool
The Case Processing Argument, Courts, Defense, and Prosecution Capacity The jail appropriately detains individuals on serious charges who present genuine pretrial risk. The analysis identifies a separate and distinct driver of ADP: 18.4% of 2025 bookings were held with no bail allowed, dominated by DOC detainers, assault Domestic Violence (DV), and serious warrant holds. Case processing speed directly affects the length of pretrial stays for the remaining population. When cases take longer, people stay in jail longer, ALOS rises, and ADP rises accordingly. Every improvement in case processing speed is a factor in jail population management, alongside facility capacity and diversion programs.
Estimated Pretrial 2025
~81%
3,860 of 4,745 bookings, bail bond set or personal recognizance, awaiting case resolution
Pretrial, not sentenced
No Bail, Serious Holds
18.4%
873 bookings · DOC detainers, DV assault, serious warrants · appropriate detention, longest stays
Appropriate pretrial hold
Sentenced
19.4%
919 bookings · serving a sentence or DOC transport
Released to Treatment
34
Direct connection to treatment program · 2025 · this pathway should be dramatically expanded
Expand this pathway
Dismissed or Charge Not Filed
375
Jail capacity consumed while the system determined no charge would proceed, case processing investment addresses this
BH Population ALOS
Highest
Behavioral health population has the longest stays and highest daily cost, primary driver of ADP at any booking level
Primary ADP driver
System Investment
Average Length of Stay, The Drivers and What Reduces It
The Whole System Shapes ADP Average length of stay is determined by decisions made throughout the justice process, from arraignment timing and pretrial release conditions to case processing speed, plea availability, and behavioral health treatment access. Each of these is influenced by resourcing decisions outside the corrections department. Underresourced courts, public defenders, and prosecutors extend time-to-disposition, which directly increases ALOS and therefore ADP. Adequate behavioral health treatment capacity at the point of reentry reduces the rate of return bookings, which reduces the share of ADP attributable to repeat contacts.
⚖️
Court Capacity & Case Processing Time
Delayed arraignments, crowded dockets, and insufficient hearing availability extend time between booking and disposition. Every additional day of pretrial detention multiplies across the pretrial population to raise ADP. Court capacity investment directly affects time-to-disposition.
System factor: case processing
🛡️
Public Defender Resources
Overburdened public defenders cannot process cases quickly. Excessive caseloads mean cases take longer, people stay in jail longer, and ADP rises. Washington State has documented significant public defender shortfalls. Defender capacity affects time-to-disposition across the pretrial population.
System factor: case processing
📋
Prosecutor Workload & Case Complexity
Complex cases require time, and that time is served in the jail. Prosecutors managing high caseloads without sufficient support staff cannot move cases as efficiently as they need to. Prosecutor resource levels affect case processing speed.
System factor: case processing
🏥
Behavioral Health Treatment Capacity
People with serious mental illness and co-occurring disorders have the longest average stays in the jail. They often cannot participate effectively in their own defense, require competency evaluation, and cycle back. People with serious mental illness and co-occurring disorders have among the longest average stays in the jail.
System factor: behavioral health
🏠
Housing Stability
People without stable housing are less able to post bail, less able to maintain contact with counsel, more likely to miss court and accumulate warrant holds. Housing stability is associated in the research literature with both lower rebooking rates and improved court appearance rates.
System factor: housing stability
🔄
Pretrial Services & Supervision
A robust pretrial services program, risk assessment, court date reminders, supervision, allows judges to release people they would otherwise hold, reducing ADP without increasing risk. The research literature documents measurable effects of pretrial services programs on court appearance rates and pretrial detention volumes.
System factor: pretrial services
2025 Data
What the Return Data Shows About Quick-Release Individuals
How to Read This When an individual is released on a misdemeanor, warrant, or administrative hold, the categories that constitute the majority of quick releases, the operationally relevant question for corrections planning is: at what rate and under what circumstances do they return? The 2025 data allows us to track that. Of 1,716 individuals whose bookings involved only charges typically associated with quick release, 80% did not return for any booking during the rest of 2025. Among those who did return, the median time was approximately 80 days.
Return Pattern, Quick-Release Individuals, 2025
1,716 individuals tracked through December 31, 2025 · percentage returning for any subsequent booking
Did not return
80.0%, 1,373 individuals
Returned (any time)
20.0%, 343 individuals
→ Within 6 months
16.1%
→ Within 3 months
10.6%
→ Within 1 month
4.3%
→ Within 1 week
1.1%
→ Same day
0.1%
Median return time among those who came back: approximately 80 days. Mean: 101 days. Among returning individuals, the charge profile skews toward warrant and misdemeanor categories. Source: WCSO Booking Data 2025. Analysis: Chuckanut Health Foundation.
Diversion Programs
Law Enforcement Assisted Diversion (LEAD), Law Enforcement Assisted Diversion
Operational Model, How LEAD Works
LEAD redirects individuals from jail booking to structured case management, with law enforcement retaining referral authority.
LEAD is a law enforcement-led diversion model in which officers refer individuals, at the point of contact, using professional discretion, to a case manager who coordinates access to behavioral health treatment, housing stability services, and court compliance support. The officer retains authority over the referral decision. LEAD operates in Whatcom County and has been active since before the Justice Project. The Washington State University (WSU) 2023 Progress Report found that as diversion programs in Whatcom County expanded from 2015–2019, one-year recidivism fell from 35% to 18%, though that change reflects multiple programs and system factors, not LEAD alone. The research literature on LEAD nationally documents reduced bookings and improved outcomes in multiple jurisdictions; results vary by implementation.
1
Officer makes contact, charge is eligible for diversion under LEAD criteria (officer retains discretion)
2
Officer refers individual to LEAD case manager, structured handoff, not release without consequence
3
Case manager coordinates behavioral health assessment, treatment access, housing navigation, and court compliance support
4
Outcomes tracked, recidivism, treatment engagement, court appearance rates, with accountability for program performance
Pasquo 2026 · DLZ · Chuckanut Health Foundation analysis
Forecast vs. Planning Scenario, The 58-Bed Gap
Pasquo primary 2030 bed forecast: 422 · County planning scenario: 480

Source: Pasquo Planners Jail Population Forecast, March 2026; DLZ Needs Assessment 2024. Note: Pasquo not yet publicly released pending county distribution.

WASPC NIBRS 2024 · WCSO 2025
Crime Offenses vs. Bookings, The Divergence
NIBRS reported offenses vs. deduplicated bookings, indexed to 2019 baseline

Source: WASPC Crime in Washington 2024; WCSO Booking Data 2023–2025. Indexed to 2019 baseline.

Current System
Capacity Thresholds and Operational Response, What the Data Shows
Context The booking restriction system (effective February 1, 2025) is population-triggered, activating automatically based on inmate count thresholds. At every level, all felony arrests, all domestic violence offenses, and all public safety situations remain fully bookable. What shifts at Yellow and Red levels are misdemeanor warrants and non-DV misdemeanor arrests. The restriction document is available through WCSO; the thresholds and permitted booking categories are detailed in the table below.
LevelThresholdFeloniesDV OffensesGross MisdemeanorsMisdemeanors
GREENUnder 300 ✓ All✓ Always✓ All✓ All
YELLOW300–319 ✓ All✓ Always✓ All ↗ Misdemeanor warrants & PC: restricted
RED320+ ✓ All (w/ prosecutor review)✓ Always ✓ DV, harassment, stalking, DUI ↗ All misdemeanors: restricted
⚠ Beta Project, This data initiative is under active development. Figures, methodology, and content are subject to revision. If you notice an error, have additional data, or want to flag an omission, please email info@chuckanuthealthfoundation.org. We are grateful for corrections.