blog DUI Do You Have to Be Driving the Boat? Understanding BUI Charges in Silverthorne

Do You Have to Be Driving the Boat? Understanding BUI Charges in Silverthorne

By Colorado Attorney-at-law on February 11, 2026

Many people assume that a Boating Under the Influence (BUI) charge only applies if they were actively driving the boat. However, under Colorado law, that is not always the case.

If you are seated at the helm, or if you are directing others who are operating the boat, law enforcement could argue that you are in operation or control of the vessel, and you could be charged with BUI. You can also be charged with BUI when a boat is anchored or drifting with the engine off.

The experienced Silverthorne BUI lawyers at Whitaker & Penix, LLC understand the nuances of Colorado boating law. If you are facing allegations tied to boating activity, understanding how these laws work and how they can be effectively challenged could make a big difference in how your case is resolved

What Is BUI Under Colorado Law?

Colorado’s boating under the influence (BUI) law prohibits operating or being in actual physical control of a vessel while impaired by alcohol or drugs. While this sounds similar to DUI laws, the boating environment introduces unique legal and factual questions.

A person can face BUI charges if they:

  • Operate a motorized or non-motorized vessel while impaired
  • Have a blood alcohol content (BAC) of 0.08% or higher
  • Are under the influence of drugs or a combination of substances

A blood alcohol content (BAC) of 0.08% or higher can lead to charges, but impairment can also be based on observed behavior.

It’s also important to remember that the key issue is not always whether someone was steering the boat at the exact moment law enforcement intervened. Instead, prosecutors may focus on whether the person had operation or control of the vessel.

BUI vs DUI Colorado Legal Differences

Although BUI and DUI charges share similarities, there are important distinctions:

  • Environment: DUI occurs on roads; BUI occurs on open water, where conditions are less controlled
  • Testing challenges: Field sobriety tests are harder to administer accurately on a moving or unstable surface
  • Enforcement agencies: BUI enforcement is often handled by Colorado Parks and Wildlife or marine patrol units rather than traditional police
  • Evidence issues: Observations can be less reliable due to waves, wind, and lighting conditions

What Does Operation or Control Really Mean?

According to the legal definition of operation or control, prosecutors do not necessarily need to prove that you were actively navigating the boat to charge you with BUI. Instead, they may argue that you had the ability to control the vessel.

This can include situations where a person:

  • Is seated at the helm
  • Has access to the ignition or controls
  • Is directing others operating the boat
  • Recently operated the vessel and could resume control

You Do Not Have to Be Driving the Boat to Get a BUI

There are a number of scenarios when a person can be charged with BUI even when the boat is not moving, or when someone else was technically operating the vessel.

Anchored or Drifting Boats

If the boat is anchored or drifting with the engine off, prosecutors may still argue that someone in a position of authority had control. However, this is often a strong area for defense. If there is no active operation and no immediate intent to operate, the case becomes weaker.

Shared Operation

Many recreational boaters take turns driving. If multiple people had access to the controls, it can be difficult for the prosecution to prove who was in control at a specific time.

Passengers at the Helm

Sometimes a passenger briefly takes the wheel while the primary operator steps away. If law enforcement arrives during that moment, determining actual control becomes a complicated legal issue.

Engine Off Situations

If the engine is off and the boat is stationary, the argument that someone was actively operating the vessel becomes less clear.

How BUI Is Enforced in Silverthorne

Lake Dillon is a heavily trafficked recreational area, especially during peak seasons. Enforcement is typically carried out by:

  • Colorado Parks and Wildlife officers
  • Local marine patrol units
  • Occasionally, county law enforcement agencies

These officers are tasked with enforcing Colorado Parks and Wildlife boating laws, including safety regulations and impairment-related offenses.

Because boating conditions are dynamic, officers often rely on:

  • Visual observations of behavior
  • Reports from other boaters
  • Field sobriety testing conducted on docks or boats
  • Chemical tests (breath or blood)

Strategic Legal Defenses in BUI Cases

Every BUI case is fact-specific, but several defense strategies may be used to create reasonable doubt.

  • Challenging Operation or Control. If the prosecution cannot clearly establish that you were operating or in control of the vessel, the case may not meet the legal standard required for conviction.
  • Questioning the Reliability of Testing. Field sobriety tests and even chemical tests may be challenged based on how and where they were administered.
  • Highlighting Environmental Factors. Conditions on the water, such as waves, glare, and weather, can explain behavior that might otherwise be interpreted as impairment.
  • Disputing Officer Conclusions. Cross-examining how conclusions were reached can expose gaps in the investigation.
  • Establishing Alternative Operators. If others had equal access to the boat’s controls, this could introduce reasonable doubt about who was actually in control.

Speak With an Experienced Summit County BUI Defense Attorney Today

If you are facing allegations related to boating under the influence laws in Summit County, Whitaker & Penix, LLC is here to help. Our legal team understands how to analyze the details, challenge the evidence, and build a strong defense tailored to your situation.

Call (970) 368-0602 today to schedule your free consultation today.

FAQs: Understanding BUI Charges in Silverthorne

What qualifies as Boating Under the Influence (BUI) in Colorado?

Under Colorado law, BUI occurs when a person operates or is in operation or control of a vessel while impaired by alcohol or drugs. A blood alcohol content (BAC) of 0.08% or higher can lead to charges, but impairment can also be based on observed behavior.

Do I have to be actively driving the boat to be charged with BUI?

No. You do not have to be actively steering the boat. Prosecutors only need to show that you had operation or control of the vessel. This could include being at the helm, having access to the controls, or being in a position to operate the boat.

How are BUI laws enforced on Lake Dillon?

BUI laws are typically enforced by Parks and Wildlife officers and local marine patrol units. These officers monitor boating activity, conduct safety checks, and investigate suspected impairment under Colorado Parks and Wildlife boating laws.

What defenses are available for Summit County BUI charges?

A strong BUI defense often focuses on whether the prosecution can prove operation or control. Other defenses may include challenging field sobriety tests, questioning officer observations, or showing that someone else was operating the vessel.

 

Posted in: DUI