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Difficulty II-III
Length 3.8 Miles
Flow Range 400 - 4800 CFS
Flow Rate as of: 15 minutes ago ~ 174 [CFS] ℹ️
Reach Info Last Updated 08/20/2004 11:38 am

River Description

Ed Evangelidi shared:

This is a solid intermediate-level stream. Not only do the rapids require some skill but the durn dams require considerable attention. All are runnable but with a significant amount of attention to hydraulics or other problems. One small dam early on is very retentive. The suggested put-in is at a small campground on Business 15, where a small fee is charged. The Monocacy gauge at Bridgeport is a much better gauge but I do not have a correlation yet.

For more information, see Keystone Canoeing by Gertler, E.
There's a lowhead dam just near the campground. "Give it some respect," says Bernie Farmer of the Monocacy Canoe Club.

Rapid Descriptions


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Earl Baer
10 months ago

A few of us ran Marsh Creek July 24, 2018 from Marsh Creek Road to Mason Dixon Road. The level was 7' on the stick gauge on Marsh Creek at the Mason Dixon road bridge, almost 4,000 cfs on the Monocacy gauge. At this level the run is quite exciting. The section just above Natural Dam is quite continuous class III-IV, chucked full of large retentive holes, boiling eddy lines, and fun wave trains. We ran Natural dam far right next to the bank. At this level several spots open up on the dam and appear runnable. If you run it elsewhere make sure to hit it with speed, get a good boof stroke, and paddle hard at the bottom as the dam forms a very sticky hydraulic. One of our crew ran the "normal" line on the right and nearly got caught in the hydraulic. If getting on at this level a solid roll is recommended as swims can be fairly difficult and quite hazardous with all of the strainers.

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7 years ago

Use Bridgeport gauge (MD) just downstream - 400 cfs is your zero. [Jug Bridge, 35 miles further downstream and with over 10x the streamflow - gives late and imperfect info.] After Rte 15 comes Harper Hill, a 3-part Cl. III large-boulder rapid - followed by a long pool and then a 2-part Cl. II+ rapid. Next, Natural Dam - ca 3-ft high (on the right) can be run (on the right). - Alf Cooley

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9 years ago

Just a note--when we ran this today, the campground owner no longer allowed boaters to park at the campground because of liability. Had to choose an alternate put-in at a gravel lot on the right hand side a bit further down Marsh Creek road, but I believe this may have eliminated the first low-head dam and some flatwater. Nice run. SLD

Gage Descriptions

This gage is on the Monocacy, and thus is only a rough guide to the runnability of Marsh. Use it with discretion!

Directions Description

We have no additional detail on this route. Use the map below to calculate how to arrive to the main town from your zipcode.

No Accident Reports



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Pennsylvania Dam Removal Conference to be Held January 31st.

Kevin Colburn

There will be a one day conference on January 31st in eastern Pennsylvania that will address dam removal and rehabilitation in the state and region. It is likely that this very affordable conference would be helpful to paddlers interested in working on dam removal projects in Pennsylvania and elsewhere. Registration for the conference is due by January 23rd.

Matt Muir


Revision #Revision DateAuthorComment
1191428 08/20/04 n/a n/a