Before the Call
Infrastructure Training Series · Dam EAP

Oroville Dam Spillway Crisis

Butte County, California · February 7–14, 2017 · 188,000 Evacuated

Dam Emergency Mass Evacuation Multi-Jurisdiction EAP Activation Information Management
For five days before 188,000 people were told to run, dispatchers at Butte County's communications center were receiving information from a dam operator, a sheriff's command staff, a public watching on social media, and a news cycle — and the signals didn't agree. This exercise is about those five days. The mass evacuation phase gets most of the attention. The dispatch challenge that made it harder was everything that happened before the order was given.
Section 1 — The Situation

What Was Happening at the Dam

Before you can understand the dispatch challenge, you need to understand what was physically occurring — and why the comm center's picture of it was incomplete for most of the incident.

The Facility
Oroville Dam sits on the Feather River in Butte County, California. At 770 feet, it is the tallest dam in the United States. The reservoir — Lake Oroville — holds up to 3.54 million acre-feet of water. It is the backbone of the California State Water Project, delivering water to 27 million Californians. The dam has two spillways: a main concrete flood control spillway and an emergency spillway — an unlined concrete weir designed to allow water to flow over a bare hillside into the Feather River below. The emergency spillway had never been used in the dam's nearly 50-year history.
What the Comm Center's Coverage Area Included
The Butte County Sheriff's Office and CAL FIRE Butte County share a joint Emergency Command Center (ECC) handling law enforcement and fire/EMS dispatch for Butte County. Their dispatch center itself sits within the potential inundation zone. Downstream communities in Yuba and Sutter counties have their own PSAPs — any evacuation order for Oroville immediately becomes a multi-county, multi-PSAP event.
Section 2 — The Dispatch Timeline

What the Comm Center Saw, and When

This timeline is told from the console — what the PSAP knew, received, and had to act on at each stage. It is not the engineering timeline.

February 6–7, 2017 — Early Storm Period
January and February 2017 were among the wettest months on record for the Feather River basin. The watershed received an entire year's average runoff in 50 days. Dam operators were releasing water through the main spillway at high rates to manage lake levels. This was known and expected — normal winter operations. No notification to the PSAP at this stage.
February 7, ~10:00 AM — First Notification to PSAP
Dam operators noticed an unusual flow pattern in the main spillway and closed the gates to investigate. They found a 250-foot-wide, 50-foot-deep crater where the concrete lining had failed. DWR notified Butte County via automated/recorded message using language that did not convey the severity of what had been discovered. The Sheriff's Office dispatch center logged the call. The Sheriff himself learned about the spillway damage from a text message from a local media contact — not through the formal EAP notification chain.
February 8–10 — Managed Releases, Continued Monitoring
Operators resumed releases through the damaged spillway at reduced rates to lower the lake level before incoming storms arrived. Dam safety engineers from DWR, FERC, and consulting firms were on site evaluating the main spillway damage. Public messaging: "No danger to public safety." The PSAP was not in an active EAP notification posture. The public was beginning to watch via social media and news coverage.
February 11 — Emergency Spillway Activated for First Time in History
Lake Oroville reached 901 feet — the elevation at which water would flow over the emergency spillway weir. It began flowing for the first time since the dam was built in 1968. Officials stated publicly that there was no danger of the main embankment being breached and that evacuation was not being considered. Almost immediately, officials noticed the hillside below the emergency spillway was eroding far faster than expected. The erosion began eating uphill toward the concrete weir.
February 12, Morning — Erosion Reaches Critical Rate
Engineers monitoring the hillside erosion calculated the rate and the distance remaining to the concrete weir. At approximately 20 feet per hour, the erosion was roughly 20 feet from undermining the weir. If the weir collapsed, an estimated 30-foot wall of water would enter the Feather River immediately downstream. Sheriff Honea met with engineers and state officials. He recapped his understanding of the situation, asked if he was missing anything, and when the room was silent, gave the evacuation order.
February 12, 4:21 PM — Mandatory Evacuation Order Issued
The Butte County Sheriff issued a mandatory evacuation order for low-lying areas of Oroville and downstream communities along the Feather River Basin. Yuba and Sutter counties followed with evacuation orders and warnings for their jurisdictions. Within hours, approximately 188,000 people were under mandatory evacuation or evacuation warning across three counties. The Butte County dispatch center began simultaneous handling of evacuation 911 calls, downstream county notifications, hospital coordination, and mutual aid requests — while preparing to potentially relocate their own facility out of the inundation zone.
February 12, Evening — Situation Stabilizes
By 9:00 PM, increased main spillway releases had successfully lowered the lake level below the emergency spillway lip, stopping the flow over the hillside. The immediate threat of weir collapse was reduced. Evacuees were not allowed to return until February 14. The aftermath: $1.1 billion in repairs, zero fatalities, and the creation of the Cal OES Dam Safety Planning Division — a direct result of this incident.
Section 3 — The PSAP's Role

Notification Flowchart — What the EAP Required

The notification flowchart below reflects what the EAP framework required of the PSAP and how it was designed to flow. Where the real incident deviated from the designed flow, it is noted.

⚠ Critical Gap — The Incident Revealed This Before Anything Else
The EAP required DWR (the dam operator) to notify the PSAP using clear, classification-based language. On February 7, the notification DWR sent used language that did not convey the severity of a 250-foot crater in the main spillway. The Sheriff learned about the damage informally. There was no protocol for the PSAP to escalate an ambiguous dam operator notification to command-level review. The system worked as designed. The design had a gap.
Notification Flowchart — PSAP Outbound Sequence
IN
Dam Operator (DWR) → PSAP
DWR notifies Butte County ECC of emergency condition, classification level, and recommended downstream action. In 2017: automated message used non-urgent language. Did not trigger EAP-level response.
1
PSAP → County OES Duty Officer / Sheriff Command
Immediate notification to the Sheriff's Office command staff and County OES for situational awareness and decision authority on evacuation.
2
PSAP → Downstream County PSAPs
Yuba County Communications and Sutter County OES Communications notified. In a Feather River corridor event, all three counties may ultimately be under some form of evacuation order or warning.
3
PSAP → California OES Warning Center
State-level notification for mutual aid coordination, National Guard activation support, and statewide resource requests.
4
PSAP → National Weather Service Sacramento
Coordination for Wireless Emergency Alert (WEA) integration and weather status — critical given the incoming storm system during the 2017 incident.
5
PSAP → Law Enforcement Traffic Control
CHP and downstream county law enforcement for evacuation corridor management. Hwy 70 north and Hwy 162 west were primary corridors. Hwy 99 south of Marysville was in the potential inundation path.
6
PSAP → Hospital and Care Facility Coordination
Oroville Hospital required ambulance strike team coordination for patient evacuation. Multiple care facilities in the inundation zone required special transport resources.
!
GAP — No Protocol for PSAP Continuity of Operations
The Butte County dispatch center is in a potential inundation zone. There was no pre-established alternate facility protocol. Dispatchers continued operations while simultaneously preparing to physically relocate their center during the active evacuation. This gap was identified in the after-action report.
Section 4 — The Decision Points

Where Dispatcher Judgment Mattered

These are the operationally significant moments — where the comm center had choices to make, information that didn't fit neatly together, or where the EAP was silent. Click each to expand.

On February 7, DWR's notification to the PSAP described the situation in terms that did not convey the discovery of a 250-foot crater in the main spillway. At roughly the same time, photos of that crater were appearing on Facebook, shared by people near the dam. A dispatcher answering a 911 call from someone describing "a huge hole in the dam spillway" and then looking at the DWR notification in the log — what is the protocol?

Most EAPs have no answer to this question. The notification flowchart assumes the dam operator's call is the authoritative trigger. The EAP does not address what happens when public reporting appears to contradict the operator's characterization of the situation. This is worth examining in your own center's plan: if a caller reports something that your written EAP notification doesn't account for, who decides whether to escalate?

By February 12, the Butte County dispatch center was receiving information from DWR, Cal OES, the Sheriff's command staff, downstream county PSAPs, field units, and a high volume of 911 calls from a public that had been watching the situation on social media for five days. Not all of these sources had the same information, and in some cases the information conflicted.

The after-action report documents that a unified command notification protocol was not established until well into the event. Until that structure was in place, the PSAP was the hub of a multi-source information environment with no single authoritative feed. The question for your center: who is the PSAP's single point of contact for authoritative dam status information during an EAP activation, and what happens when that contact is not reachable?

When the mandatory evacuation order was issued at 4:21 PM on February 12, the Butte County dispatch center — the facility from which 911 calls were being answered — was itself in the potential inundation zone. Dispatchers Jennifer Honea and Trina Wehle, later interviewed by Cal OES, described continuing to answer calls while simultaneously preparing to physically relocate their center.

There was no pre-established alternate dispatch facility protocol in the EAP. The center had to improvise continuity of operations in real time while managing the highest call volume of their careers. Does your center's dam EAP address what happens if the dispatch center itself must evacuate? Where would you go, how would you get there, and who covers the console during the transition?

The 2017 incident included five days of official public messaging characterizing the spillway damage as a non-public-safety issue. Then at 4:21 PM on February 12, a mandatory evacuation order went out for 188,000 people with little immediate lead time. The call surge to 911 came from a public that was confused, frightened, and had been told for nearly a week that everything was under control.

Callers asked: Is the dam broken? Which roads can I use? What zones are evacuating? Is Marysville evacuating too? My grandmother is in a care home in Oroville — what do I do? Dispatchers fielded all of this simultaneously with the outbound notification calls, resource coordination, and their own facility relocation. How does your center's protocol address high-volume call management when the call drivers are primarily information-seeking rather than emergency response?

A Feather River corridor flood event immediately affects Butte, Yuba, and Sutter counties. All three have independent PSAPs. When Butte County issued the evacuation order, downstream counties followed — but coordination between the three communications centers during the escalation phase (February 7–12) was documented as inconsistent in the after-action report.

Evacuation routes that are safe in Butte County (Highway 99 northbound) may run into the inundation zone in Yuba and Sutter counties. A caller evacuating from Oroville calling 911 in Sutter County is talking to a dispatcher who may not have the same situational picture as Butte County. Does your center have a protocol for information sharing with downstream PSAPs during a dam event, separate from the formal notification flowchart?

Section 5 — Operational Lessons

What This Incident Produced

Zero fatalities in the evacuation of 188,000 people is a remarkable outcome. The after-action process identified the gaps that got the incident to the evacuation point in the first place.

Lesson 1 — Plain Language in EAP Notifications
The 2017 incident directly caused FERC and Cal OES to push for plain-language emergency level communications from dam operators to PSAPs. The shift from code words and jargon to clear, classification-based language — "this is a Potential Failure condition at Oroville Dam" rather than a vague automated message — is now embedded in EAP reform guidance. When your center receives a notification from a dam operator, do you know what classification level it represents and what action it requires?
Lesson 2 — The EAP Must Address PSAP Continuity
If your dispatch center is in the potential inundation zone of a dam in your EAP, the plan needs a COOP component. Where is your alternate facility? How does the transition happen during active operations? Who authorizes the relocation and when? The Butte County dispatchers improvised this under extraordinary pressure. That improvisation succeeded — but it should not have been an improvisation. Check your center's dam EAP: does it address what happens to the dispatch center if the center is in the flood zone?
Lesson 3 — A Single Authoritative Information Source
The multi-source information environment of February 12 — DWR, Cal OES, Sheriff's command, field units, and a surge of public 911 calls — required a unified command structure to resolve. That structure was established, but not quickly enough to eliminate the confusion window. Your center's EAP should identify a single point of contact who provides authoritative dam status to the PSAP during an activation, with a backup if that contact is unreachable.
Lesson 4 — The Regulatory Result
The Oroville Dam spillway crisis directly resulted in the creation of the Cal OES Dam Safety Planning Division. California Senate Bill 92 (2017) required EAPs for all non-low-hazard dams, mandated Cal OES review and approval, and established new coordination requirements with local public safety agencies. The incident that revealed the gap also produced the institutional mechanism to close it — in California. The PSAP community nationally has been slower to absorb the implications.
Section 6 — Discussion Questions

For Your Shift or Training Session

There are no right answers. The goal is to surface what your center would actually do — and identify where your current EAP is silent.

Discussion 1
Your center receives an automated notification from the dam operator. The language is vague — "a maintenance condition has been identified at the main spillway." An hour later, a 911 caller reports seeing "a massive hole and water spraying sideways" near the dam. What do you do with the discrepancy, and who do you call?
Consider: Does your center have a protocol for escalating ambiguous dam operator notifications? Who has the authority to treat an informal public report as a trigger for EAP-level action?
Discussion 2
You are managing four incoming calls simultaneously — the dam operator calling with an update, a downstream county PSAP calling to ask what's happening, a field unit asking for routing guidance, and a 911 caller whose elderly mother is in a care home in the evacuation zone. How do you prioritize, and what risks does your prioritization create?
Consider: Your center's current protocol for multi-source simultaneous notification management. Is there a dedicated position for dam event coordination, or does this fall on the primary dispatcher?
Discussion 3
The evacuation order is issued. Your center is in the inundation zone. You have 23 minutes before the potential arrival of flood water if the weir collapses. You are still taking 911 calls. What's your COOP plan, and does it actually exist in writing?
Consider: Pull out your center's dam EAP right now. Does it reference your facility's location relative to the inundation zone? Does it include a continuity of operations component?
Discussion 4
For five days before the evacuation order, your center has been receiving and logging DWR notifications. The public has been told there is "no danger to public safety." When the evacuation order arrives, you receive 400 calls in the first 30 minutes. Many callers are angry — they were told it was fine. How do you manage caller tone while processing an active mass evacuation?
Consider: Call handling protocols during high-volume events. Does your center's training include managing callers whose distress is partly driven by perceived official misinformation?
Discussion 5
Pull out your center's Oroville Dam EAP — or whichever high-hazard dam EAP covers your jurisdiction. Find the notification flowchart. Can you answer these questions right now: What is the first call your center receives? What do you do next? Who do you call? What information do you pass? How long does it take your current staffing level to complete the full notification chain?
The point of this question is not to embarrass anyone. The point is that if you had to answer it from memory right now, at 0300, with a skeleton crew, you should be able to. If you can't, that is the training gap this exercise is designed to address.
Section 7 — Knowledge Check

Five Questions

Operational judgment, not trivia. Progress is saved locally on this device.

Oroville Dam — Knowledge Check

Select the best answer for each question, then submit.

Question 1 of 5
On February 7, the PSAP received a notification from DWR about the spillway. The Sheriff learned about the damage through a different channel. What does this illustrate about EAP notification design?
Question 2 of 5
The Butte County dispatch center is located in the potential inundation zone. The 2017 incident revealed no pre-established protocol for dispatch center relocation. What should a dam EAP include to address this?
Question 3 of 5
During the February 12 evacuation, callers were confused and some were angry — they had been told for five days there was "no danger to public safety." As a dispatcher, your role in this situation is:
Question 4 of 5
A Feather River corridor dam emergency affects three counties. During the 2017 incident, coordination between the three county PSAPs during the escalation phase was documented as inconsistent. The most effective fix for this is:
Question 5 of 5
The most significant long-term result of the 2017 Oroville Dam spillway crisis for the PSAP community was:
0/5
Review the feedback above for each question.
Section 8 — Source Materials

References

Before the Call
Infrastructure Training Series

This exercise is part of the Infrastructure Training Series — scenario-based dispatcher training built from real EAP incidents. Free exercises, custom builds for your agency's specific plans, and a subscription curriculum that keeps your team current.

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