Last updated 2026-08-18
TL;DR
Colorado issues no state captain license. To take passengers for hire on navigable water, you need the federal USCG OUPV (six-pack) credential. That means 360 days of sea service, a physical, a drug test, first aid and CPR, and a background check. Government fees run about $265, and the whole process usually takes 60 to 120 days after you submit a complete application.
Do you need a license to be a six-pack captain in Colorado?
Yes, and it's federal, not a Colorado state license. Colorado issues no commercial captain credential of its own. The controlling authority is the U.S. Coast Guard under 46 U.S.C. § 8903, which requires anyone carrying passengers for hire on uninspected vessels to hold a valid USCG merchant mariner credential [1].
The credential most new captains chase is the Operator of Uninspected Passenger Vessels (OUPV), almost always called the six-pack because it lets you carry up to six paying passengers. That limit applies on navigable U.S. waters, and "navigable" matters a lot in Colorado.
Colorado's boating law (CRS § 33-13-101 et seq.) covers vessel titling, registration, and operator education for recreational boaters. It does not create or replace the federal commercial operator requirement [2]. So even with your Colorado boater safety certificate in hand, you still need the USCG OUPV before you take money for the trip.
What waters in Colorado actually count for six-pack operations?
This is where Colorado gets genuinely complicated. The OUPV authorizes operation on "navigable waters of the United States," a legal term of art, not a physical description. Not every lake or reservoir in the state qualifies.
The Army Corps of Engineers and USCG define navigable waters by historical use in interstate or foreign commerce. Dillon Reservoir, Lake Granby, Blue Mesa Reservoir, Vallecito Reservoir, and stretches of the Colorado and Arkansas rivers have been treated as navigable for federal purposes in various Coast Guard determinations. Smaller landlocked ponds and ranching reservoirs almost certainly are not [3].
Planning fishing charters, rafting tours, or lake cruises on a Colorado body of water? If you're not sure it qualifies as navigable, contact USCG Marine Safety Unit Denver before you spend a dollar on training. Getting that answer in writing protects you. The OUPV carries a geographic endorsement (inland, near coastal, or ocean), and Colorado operations are inland-only for almost every realistic case.
One more layer. Certain commercial outfitting and guiding operations on Colorado rivers require a state outfitter license under the Colorado Outfitters Registration Act (CRS § 12-55-101), and some rivers require whitewater outfitter permits from Colorado Parks and Wildlife. Those are separate from the USCG credential and do not substitute for it [4].
What are the USCG OUPV requirements you need to meet?
The federal requirements come from 46 CFR Part 10 and Part 11 [5]. Here's what every applicant has to show.
Sea service. You need 360 days of underway experience, with at least 90 of those days in the past three years. A "day" means a minimum of four hours on the water. For Colorado applicants, this is usually the longest pole in the tent. Mountain lake fishing, powerboat hours on reservoirs, kayak guiding, and sailing all count if you document them right.
First aid and CPR. You need a current first aid certificate and CPR certification from a course approved by the American Red Cross, American Heart Association, or an equivalent provider. Both have to be valid at the time of application.
Physical examination. A physician completes form CG-719K. Vision, hearing, blood pressure, and general fitness standards apply. The full standards sit in 46 CFR § 10.215 [9].
Drug test. You need a negative result on a 5-panel DOT-style drug screen from a SAMHSA-certified lab. This one is non-negotiable.
Background check. The Transportation Worker Identification Credential (TWIC) is technically separate, but most OUPV applicants need one too. The TSA issues TWICs after a criminal history check. Certain felony convictions create permanent or temporary disqualifiers [6].
Exam. You pass a written exam at a Regional Exam Center or through an approved third-party testing provider. It covers rules of the road (COLREGS and inland rules), chart navigation, seamanship, safety, and first aid basics.
Application evaluation runs through the USCG National Maritime Center in Martinsburg, WV. The NMC website lists approved testing providers and schedules [7].
How much does six-pack captain cost in Colorado?
There is no Colorado surcharge on top of the federal costs. What you pay is set by USCG and TSA fee schedules, plus whatever your local clinics charge. Here's an honest breakdown.
| Item | Approximate cost | Notes |
|---|---|---|
| TWIC card (TSA) | $125.25 | Fee set by TSA, confirm current rate [6] |
| MMC application fee (USCG) | $140 | Set in 46 CFR § 10.219, confirm current rate [5] |
| Physical exam (CG-719K) | $75-$200 | Varies by provider; not a government fee |
| Drug test | $40-$80 | Varies by lab and clinic |
| First aid/CPR course | $40-$120 | Red Cross, AHA, or local providers |
| Exam prep course (optional) | $0-$500 | Self-study is free; structured courses vary |
| Total government fees | ~$265 | TWIC + MMC application |
| Total realistic out-of-pocket | $575-$1,100 | Includes physical, drug test, first aid, prep |
The government fees are fixed. The variable costs (physical, drug test, course) depend on who you use and where you are in Colorado. Denver has enough occupational health clinics that the physical and drug test stay competitive. Rural applicants may pay more or drive farther.
Want to cut prep costs? OUPVPath sells a $149 USCG OUPV + Bareboat Kit that organizes the federal application paperwork (see /start). That's optional and replaces no official government fee or exam.
One cost people miss: if your vessel needs a USCG Certificate of Inspection (COI) because you plan to carry more than six passengers, that inspection adds cost and time. The six-pack OUPV is sized specifically to avoid the COI requirement, so most Colorado charter operators stay under six passengers to keep the vessel uninspected.
How long does it take to get a six-pack license in Colorado?
Honest answer: as long as your sea service takes to accumulate, plus 60 to 120 days of federal processing after you submit a complete application.
Sea service is the real timeline driver. Spent years boating on Dillon or Grand Lake with logbooks, receipts, and trip records for 360 days? You may be ready to apply now. Starting from zero hours? Building 360 documented underway days takes most people two to four seasons of active boating, sometimes longer for landlocked residents who only boat in summer.
Once your sea service is documented, the remaining pre-application steps usually run like this:
- TWIC enrollment and card issuance: 4 to 8 weeks after fingerprinting
- Physical and drug test: a day or two
- First aid/CPR: one-day courses are easy to find in Denver, Colorado Springs, and Fort Collins
- Exam: depends on testing site availability, figure 1 to 4 weeks
After you submit to the NMC, they target 30 days to evaluate a complete application, though real-world processing has run longer during high-volume periods. The NMC publishes a processing time dashboard worth checking before you plan your start date [7].
Realistic timeline from "I'm starting now" to wallet card in hand: six months on the short end if most of your sea service is already logged, two to four years if you're building hours from scratch.
How do you document sea service in a landlocked state like Colorado?
This is the question most national guides skip, and it's the one that trips up Colorado applicants most.
The USCG accepts sea service logs on any vessel on navigable waters. Colorado's high-altitude reservoirs and navigable river segments count if the water body is legally navigable. You document sea service on form CG-719S or through a signed letter from a vessel owner or employer on company letterhead, with the vessel's official number and a breakdown of time [7].
For self-employed or recreational boaters building hours on their own boats, a personal logbook is the starting point. Record dates, hours underway, water body, vessel name, and your role. Then have a marine surveyor, a licensed captain, or another credible person sign an attestation. The NMC reviews the documentation and can ask for clarification.
Guiding kayak or whitewater tours commercially? That time can count. Fishing guide on a private lake with no navigability status? Shakier territory, worth a call to the NMC before you bank on it.
Commercial fishing, deck hand work, or guided fishing on recognized navigable waters in Colorado or neighboring states (Utah's Lake Powell, Wyoming's Flaming Gorge) is solid sea service. Plenty of Colorado applicants spend at least a season working charter boats in coastal states to build qualifying hours faster. That's not a requirement, just a shortcut that works.
What is the step-by-step process to apply for a Colorado OUPV?
Here is the actual sequence, in order.
1. Accumulate and document 360 days of sea service. Keep a logbook from day one. Use the CG-719S format or ask your employer for a service letter. This step takes the most time and there are no shortcuts.
2. Enroll for and receive your TWIC card. Apply through the TSA Universal Enrollment Services portal, then go in person to an enrollment center for fingerprinting. The nearest Colorado centers are in Denver, Colorado Springs, and Pueblo. Confirm current locations on the TSA site [6].
3. Pass your physical exam. Find a physician willing to complete CG-719K. Many occupational medicine clinics in Denver do this routinely. The form spells out vision standards (20/200 corrected), hearing standards, and cardiovascular criteria.
4. Pass a drug test. Use a SAMHSA-certified lab. Get the documentation in the standard DOT format the NMC expects.
5. Get current first aid and CPR certifications. Both must be valid (not expired) when the NMC approves your application. Time it so they don't lapse mid-process.
6. Pass the OUPV written exam. Study the Rules of the Road, inland navigation, chart reading, and safety. Pass at an approved testing site or proctored third-party location.
7. Submit your complete application to the NMC. Use the online Mariner Credential application portal at uscg.mil/nmc. Include every supporting document. An incomplete application pauses your clock.
8. Receive your MMC (Merchant Mariner Credential). The NMC mails your credential to your address of record. Scan a copy and keep it.
For the endorsed route (adding a vessel type endorsement or radar observer), there are extra steps. The OUPV alone covers most Colorado six-pack operations.
Do you need additional Colorado state permits or licenses to operate commercially?
It depends on what you're selling and where.
Running fishing charters? The anglers in your boat still need valid Colorado fishing licenses. You as the guide may need a Colorado commercial guide license through Colorado Parks and Wildlife if you're paid to take people fishing [4]. That's separate from the USCG credential, a state-level requirement in its own lane.
Whitewater outfitters on Colorado rivers typically need a commercial outfitter registration under CRS § 12-55-101, plus specific river permits from CPW or the Bureau of Land Management for rivers on public land [4]. The Colorado River Outfitters Association is a good practical resource for which rivers need what, though always confirm with the agency directly.
Lake-based operators (sailing tours, sunset cruises, powerboat charters on Dillon Reservoir) have to check with the reservoir's managing authority. Dillon Reservoir is managed by Denver Water, and commercial operators need a permit from them on top of the USCG credential. Blue Mesa Reservoir sits on Curecanti National Recreation Area land, so the National Park Service controls commercial operating permits there.
Business licensing is a separate lane. Running a charter business means registering an LLC or sole proprietorship with the Colorado Secretary of State, getting an EIN from the IRS, and possibly collecting sales tax depending on how your service is categorized. Standard small business setup, nothing unique to maritime work.
What vessels and operations does the OUPV actually cover in Colorado?
The OUPV covers uninspected passenger vessels carrying six or fewer paying passengers. "Uninspected" means the vessel holds no USCG Certificate of Inspection. Most privately owned powerboats, sailboats, and small charter boats in Colorado fall here.
The credential is limited to the waters named in the endorsement. For Colorado operations, you'd typically get an Inland Waters endorsement. To operate near coastal or offshore, you'd need a separate near coastal endorsement, which requires additional sea service on those waters.
The credential does not cover:
- Carrying more than six paying passengers (requires a Master's license on an inspected vessel)
- Commercial towing (requires a separate towing endorsement)
- Operating vessels over 200 GRT as master (requires a Master's license)
For most realistic Colorado charter operations (fishing guide on a reservoir, scenic lake tour, small group rafting support), the OUPV is the right credential and it's enough on the federal side.
A note on horsepower and vessel size: the OUPV has no vessel horsepower limit, but your sea service should be on vessels reasonably similar to what you plan to run commercially. The NMC looks for relevant experience.
Colorado's inland-water context contrasts sharply with coastal states. See our guides to how to start six-pack captain in Alaska and how to start six-pack captain in California for that comparison.
What are the biggest mistakes Colorado applicants make?
A few patterns show up again and again in the NMC application process, and Colorado applicants carry some state-specific traps on top of the usual ones.
Assuming any Colorado water counts as navigable. It doesn't. Build 360 days on a private ranch pond that has never been commercially navigable, and the NMC may reject all of it. Verify navigability before you count a single day.
Submitting an incomplete application. The NMC stops your clock on an incomplete package. One missing form, an expired first aid cert, or a drug test on non-approved letterhead can add weeks. Check the NMC's checklist before you mail anything [7].
Letting first aid and CPR expire mid-process. Both certifications must be valid when the NMC approves your application, more than when you apply. If your course expires during a 90-day processing window, you retake it.
Forgetting the TWIC. Many applicants start the TWIC last. Start it first. Four to eight weeks of card production doesn't compress no matter how fast you move on everything else.
Skipping the separate operating permit. Reservoir managers, the NPS, BLM, and CPW all have their own permitting layers. The USCG credential substitutes for none of them.
Want a clean walkthrough of the federal paperwork? The OUPVPath kit at /start organizes the NMC document sequence, though the underlying process is identical whether you use any guide or go direct.
For a state-by-state comparison of the OUPV process, see our guides on the six-pack captain license in California and the six-pack captain license in Colorado.
How do you renew a six-pack captain license after you get it?
The MMC is valid for five years. Renewal runs through the NMC and requires:
- A new physical (CG-719K) showing you still meet medical standards
- A new drug test
- Updated first aid and CPR certifications
- Proof of sea service during the credential period (at least one day of creditable sea service, though more is better for staying sharp)
- A renewal application fee (confirm the current amount at the NMC site)
The NMC recommends starting renewal no later than eight months before expiration. Let the credential lapse and you may be back to the full application process. Don't let that happen.
46 CFR § 10.227 governs continuity of service and lapse provisions. If more than five years pass since your last renewal, you may need to re-examine [5]. The USCG sends a renewal reminder, but treat that as a backup, not your primary alarm. Track your own expiration date.
Frequently asked questions
Do you need a license for six-pack captain in Colorado?
Yes. Colorado issues no state captain license, so you need a federal USCG OUPV (six-pack) credential under 46 U.S.C. § 8903. This applies any time you take passengers for hire on navigable waters, including Colorado reservoirs and rivers that qualify as legally navigable. A Colorado boater safety certificate doesn't cover commercial operations.
How much does six-pack captain cost in Colorado?
Government fees total roughly $265: about $125.25 for the TWIC card (TSA) and $140 for the MMC application (USCG). Add a physical exam ($75-$200), drug test ($40-$80), and first aid/CPR course ($40-$120), and realistic out-of-pocket costs land between $575 and $1,100. There is no separate Colorado state fee. Confirm all federal fees at the NMC and TSA websites before applying.
How long does six-pack captain take in Colorado?
Federal processing after a complete application averages 60 to 120 days. The real variable is sea service: you need 360 documented underway days, which takes most Colorado residents two to four boating seasons to accumulate from scratch. Start your TWIC enrollment early, since card production alone takes 4 to 8 weeks. Total timeline from zero experience: typically two to four years.
Does Colorado have any state waters that count as navigable for the OUPV?
Several do, including Dillon Reservoir, Lake Granby, Blue Mesa Reservoir, Vallecito Reservoir, and navigable stretches of the Colorado and Arkansas rivers. Smaller landlocked private ponds almost certainly do not qualify. Contact USCG Marine Safety Unit Denver for a determination on any specific water body before you start logging hours there.
Can I count kayak guiding or rafting hours toward OUPV sea service?
Possibly. Hours on navigable waters in a vessel, including kayaks and rafts, can count as sea service if properly documented with dates, vessel name, hours underway, and the body of water. The NMC evaluates each application individually. Time on non-navigable water or private non-navigable lakes is not creditable. Use form CG-719S or a signed employer letter as your documentation.
Do I need a Colorado commercial fishing guide license on top of the USCG OUPV?
If you're taking paying clients fishing in Colorado, yes. Colorado Parks and Wildlife requires commercial fishing guides to hold a state guide license under state law. Your passengers also need valid Colorado fishing licenses. The USCG OUPV covers the federal vessel operation side; the state guide license covers the commercial fishing activity side. Both are required and neither substitutes for the other.
What is the nearest USCG testing location to Denver?
The USCG National Maritime Center in Martinsburg, WV handles application evaluation, but written exams are administered at approved testing providers and proctored sites across the country. Several testing providers operate in Colorado or can arrange remote proctoring. Check the NMC's approved testing provider list at the official NMC website for current Denver-area options, since provider availability changes.
Can I operate on Blue Mesa Reservoir or at Rocky Mountain National Park waters with just an OUPV?
Blue Mesa sits on Curecanti National Recreation Area land, so NPS commercial use authorization is required on top of the USCG OUPV. Rocky Mountain National Park runs its own permit system for commercial operators on its waters. Federal land managers control commercial activity permits independent of your USCG credential. Always check with the specific land management agency before starting operations.
How many passengers can a six-pack captain carry in Colorado?
The OUPV (six-pack) license allows a maximum of six paying passengers on an uninspected vessel. There is no Colorado-specific limit beyond that federal cap. To carry seven or more paying passengers, you need a Master's license on a USCG-inspected vessel with a Certificate of Inspection, which is a substantially more involved process.
What happens if my first aid or CPR cert expires while my OUPV application is being processed?
The NMC requires your first aid and CPR certifications to be valid at the time of approval, more than at the time of application. If they expire during a 90-day processing window, you retake the course and submit updated documentation. Plan your course timing so both certifications have at least six months of remaining validity when you apply.
Is a TWIC card required for Colorado six-pack operations?
The TWIC is required as part of the USCG MMC application process for most applicants. It's issued by the TSA after a criminal history review, costs about $125.25, and takes 4 to 8 weeks after fingerprinting. Even if your specific Colorado operation doesn't require TWIC access to secure facilities, you'll need it to complete your MMC application in most cases.
Can I use sea service from other states to qualify for a Colorado six-pack license?
Yes. The USCG OUPV is a federal credential and sea service counts nationally. Hours logged on navigable waters in Wyoming, Utah, Arizona, or any other state count the same as Colorado hours. Many Colorado applicants supplement local hours with seasonal work in coastal states to build qualifying days faster. Document all hours with the same rigor regardless of location.
How often do I need to renew my OUPV license?
The MMC is valid for five years. Renewal requires a new physical, drug test, updated first aid/CPR certifications, and a renewal application fee. The NMC recommends starting the renewal process eight months before your expiration date. If the credential lapses beyond the grace period under 46 CFR § 10.227, you may have to re-examine. Track your own expiration date independently.
Does the OUPV cover sailing charters or only powerboats in Colorado?
The OUPV covers both sail and power vessels. Your sea service should reflect the type of vessel you plan to operate commercially, so sailboat hours are relevant if you plan to run sailing charters. Colorado's lake sailing scene is small but real, particularly on Lake Granby and Eleven Mile Reservoir. Document your sailing hours the same way you would powerboat hours.
Sources
- U.S. Code, 46 U.S.C. § 8903, Uninspected passenger vessels: Federal law requires anyone carrying passengers for hire on uninspected passenger vessels to hold a valid USCG credential
- Colorado Revised Statutes, CRS § 33-13-101, Motorboat registration and safety: Colorado's state boating law covers vessel registration and recreational operator education but does not create a commercial captain credential
- U.S. Army Corps of Engineers, Navigation Program: Navigability of specific water bodies is determined by the Army Corps of Engineers based on historical use in interstate or foreign commerce
- Colorado Revised Statutes, CRS § 12-55-101, Colorado Outfitters Registration Act: Commercial outfitting and guiding on Colorado waters requires a state outfitter license separate from the federal USCG credential
- Code of Federal Regulations, 46 CFR Part 10, Merchant Mariner Credential: Sea service, physical examination, drug testing, application fees, and examination requirements for OUPV applicants; renewal governed by 46 CFR § 10.227
- Transportation Security Administration, TWIC Program: TWIC card enrollment fee is $125.25; criminal history review required; card production takes 4-8 weeks after fingerprinting
- USCG National Maritime Center, Mariner Licensing and Documentation: NMC administers OUPV applications, approves testing providers, publishes processing time dashboard, and accepts form CG-719S for sea service documentation
- Code of Federal Regulations, 46 CFR § 10.215, Medical and Physical Standards: Physical examination standards for vision, hearing, blood pressure, and general fitness required for OUPV applicants