Kentucky | Mammoth Cave

Green River

Dennison Ferry to Houchins Ferry

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DifficultyhardThe water remains flatwater by whitewater standards, but 19.8 miles, ferry interaction, changing gravel bars, shifting channels, limited rescue access, and a near-closure high-water ceiling make this a committed Mammoth Cave route rather than a casual float.
PermitsNone notedNo permit is required for a same-day paddle, but this route is inside Mammoth Cave National Park and follows NPS boating rules. If you intend to break the route into an overnight, use only legal campsites and carry the required riverside camping permit.
CampingOptions nearbyThis is the strongest Green River combination in the park for overnight flexibility. NPS says lower-water gravel bars and low riverbanks can support paddler camping with a valid riverside camping permit, and Houchins Ferry Campground also offers legal endpoint camping with toilets, picnic facilities, and vehicle access.
SeasonApr-OctThis long park route is best treated as a warm-season trip with stable weather, enough daylight, and a group that is comfortable with a full-day flatwater commitment. NPS warns that Green River can rise quickly after rain and that channels and gravel bars shift over time.

Dial in the shuttle, distance, and access.

Use this section once the route looks viable and you need to turn it into an actual trip plan.

Access, shuttle, and map

Launch at Dennison Ferry and continue all the way to Houchins Ferry for a long Mammoth Cave Green River day. The direct Mammoth Cave gauge anchors the route, but the current July 1 reading sits just below the park's 20-foot launch closure, so same-day judgment matters more than the mileage table.

Plan a shorter segmentOptional

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This changes launch and take-out logistics, not today's river score.

On-water distanceAbout 19.8 miLake to creek
On-water timeAbout 5 to 7 hrFull route option
ShuttleSelf-shuttleChoose a shorter in/out pair for a shorter day.

Peltier Lake to Long Lake is the full route. Shorter access pairs are useful when wind, time, or group energy changes the plan.

Start

Put-in

Dennison FerryOpen map

Dennison Ferry is day-use only with a carry-down launch. Do not plan to camp or leave gear spread across the access.

Finish

Take-out

Houchins FerryOpen map

The route passes the Green River Ferry crossing midway. NPS says paddlers must stay back, wait for eye contact from the operator, and use the canoe/kayak access on the south side if stopping there.

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Access caveats and watch for

Access caveats

  • Dennison Ferry is day-use only with a carry-down launch. Do not plan to camp or leave gear spread across the access.
  • The route passes the Green River Ferry crossing midway. NPS says paddlers must stay back, wait for eye contact from the operator, and use the canoe/kayak access on the south side if stopping there.
  • On-route camping requires a valid riverside permit and is flow-dependent. Use only legal gravel-bar or low-bank sites allowed by park rules.
  • Houchins Ferry has the best endpoint support in this route family, but the campground and ramp still operate inside a managed park setting with posted quiet-hour and facility rules.

Watch for

  • Current levels near 20 ft, when the route is still open but much more consequential than the park's broad beginner-friendly band.
  • Swift current, submerged trees, logjams, drifting debris, gravel-bar shifts, back channels, and muddy or slick access surfaces.
  • Ferry traffic at Green River Ferry, limited cell service, exposed sun, and fewer nearby bailout options than the shorter park segments.
  • Camping mistakes: rising overnight water, unsecured boats, and unauthorized stops without a valid permit.

Check the data behind today's call.

Use this section when the page shows stale data, limited confidence, or a call you want to verify before driving.

Read quality
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Data confidence mostly comes down to three things: how direct the gauge is, how clear the range is, and how fresh the data is.

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Tomorrow and weekend

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Gauge, thresholds, and timing

These are the live readings and threshold notes behind today's score.

Gauge siteGreen River at Mammoth Cave, KY
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Target band9.00 ft to 15.00 ft
Low threshold9.00 ft
High threshold20.00 ft
Data confidence behind the rangeOfficial data source
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Paddle Today updatedChecking
Main source behind this scoreMammoth Cave NPS Green River skill-level stage guidance
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What to know before you go

These notes cover the access details, route quirks, and source caveats most likely to matter once you get there.

  • Official route segmentDennison Ferry to Houchins Ferry, about 19.8-20.0 mi

    KDFWR lists Dennison Ferry to Green River Ferry as 7.5 miles and Green River Ferry to Houchins Ferry as 12.3 miles, supporting a combined public route of about 19.8 miles. NPS separately publishes the lower leg as 12.4 miles.

    Source

  • Official stage model9-15 ft broad audience, >=20 ft closed

    NPS says park launching is prohibited when river levels are at or exceed 20 feet and keeps 9 to 15 feet as the broad beginner-friendly Green River window.

    Source

  • Put-in accessDennison Ferry, 37.2174, -86.0493

    KDFWR identifies Dennison Ferry as a free day-use-only carry-down access with steps to the water, gravel parking, and no camping.

    Source

  • Take-out accessHouchins Ferry, 37.2024, -86.2376

    KDFWR identifies Houchins Ferry as a free paved park ramp with year-round camping, restrooms, picnic facilities, and ferry-side launch rules.

    Source

  • Live-gauge supportUSGS 03309000 at 6100 cfs / 19.16 ft

    USGS Water Services returned same-day July 1, 2026 discharge and stage values for Green River at Mammoth Cave during this run. That stage is below the NPS 20-foot closure but well above the park's broad beginner-friendly 9 to 15-foot band.

    Source

  • Current park access postureFerry reopened March 5, 2026; check hotline for same-day status

    Mammoth Cave says Green River Ferry resumed daily operation on March 5, 2026 after repairs, but current conditions still say road and ferry status can change without advance notice and should be checked before shuttling.

    Source

  • Camping contextPermitted riverside camping plus Houchins campground

    NPS says lower-water gravel bars and low riverbanks can support paddler camping with a valid riverside permit on the Green River Ferry-to-Houchin leg, and KDFWR says Houchins Ferry has a riverside campground.

    Source

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Green River paddling FAQ

What water level is good for paddling Green River?

Paddle Today watches Green River at Mammoth Cave, KY and treats 9.00 ft to 15.00 ft as the target band for this route, with weather and recent trend included in the final score.

Where does this Green River route start and end?

This route starts at Dennison Ferry and ends at Houchins Ferry, about About 19.8 mi on the water.

Is this Green River route good for beginners?

This is listed as a hard route. Treat the live score as a planning aid, then confirm conditions, hazards, access, and group skill before launching.

See something outdated?

Access, hazards, wood, and shuttle details change. Send a quick correction if something looks off.