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Tohickon Creek

Or, paddling for Perl geeks. ;-)

The table/graph shown below each show the approximate correlation between the web-accessible gauge at Pipersville (in CFS), and the gauge that most paddlers are accustomed to, on the bridge at Ralph Stover Park (in feet).

The quadratic equation which models this was empirically derived by John Koeppe; I wrote the Perl script that generates the table and the graph. Any mistakes are mine.

Pipersville gauge readings are available online at:

It's not that far above Ralph Stover, so the time delay between the two points shouldn't be much of an issue except under extreme conditions.

Note that nominal scheduled releases are usually around 1.8 feet, or about 750 CFS.

This is an APPROXIMATION in the range of most interest to paddlers, that is above 300 CFS (1 foot) and below 3700 CFS (5 feet). Outside of that range, it's dubious. In other words, the quadratic fit no longer really models reality, so you can't trust the model.

Frankly, if the flow is above 4 feet, it's such a difficult trip that only paddlers familiar with the river and capable of assessing the difficulty by making an on-the-spot inspection should consider attempting the run. (My own experience runs out at 4 feet and change. I'm told that above that, it starts getting seriously mean. Based on that experience, I believe it. A swim at 4 feet would be likely to end in the Delaware. Do not attempt the river at this level or above without significant whitewater experience, a bombproof roll, and a similarly qualified group.

If it's below 1 foot, bring a plastic boat and hiking boots.

Tohickon Creek Gauage Correlation Graph

Flow at
Pipersville
Ralph Stover
Park Gauge
354 CFS1.00 feet (1`0")
386 CFS1.08 feet (1`1")
419 CFS1.17 feet (1`2")
454 CFS1.25 feet (1`3")
490 CFS1.33 feet (1`4")
529 CFS1.42 feet (1`5")
569 CFS1.50 feet (1`6")
610 CFS1.58 feet (1`7")
654 CFS1.67 feet (1`8")
699 CFS1.75 feet (1`9")
746 CFS1.83 feet (1`10")
794 CFS1.92 feet (1`11")
844 CFS2.00 feet (2`0")
896 CFS2.08 feet (2`1")
949 CFS2.17 feet (2`2")
1004 CFS2.25 feet (2`3")
1061 CFS2.33 feet (2`4")
1120 CFS2.42 feet (2`5")
1180 CFS2.50 feet (2`6")
1242 CFS2.58 feet (2`7")
1305 CFS2.67 feet (2`8")
1370 CFS2.75 feet (2`9")
1437 CFS2.83 feet (2`10")
1506 CFS2.92 feet (2`11")
1576 CFS3.00 feet (3`0")
1648 CFS3.08 feet (3`1")
1722 CFS3.17 feet (3`2")
1797 CFS3.25 feet (3`3")
1874 CFS3.33 feet (3`4")
1952 CFS3.42 feet (3`5")
2033 CFS3.50 feet (3`6")
2115 CFS3.58 feet (3`7")
2198 CFS3.67 feet (3`8")
2284 CFS3.75 feet (3`9")
2371 CFS3.83 feet (3`10")
2460 CFS3.92 feet (3`11")
2550 CFS4.00 feet (4`0")
2642 CFS4.08 feet (4`1")
2736 CFS4.17 feet (4`2")
2831 CFS4.25 feet (4`3")
2928 CFS4.33 feet (4`4")
3027 CFS4.42 feet (4`5")
3128 CFS4.50 feet (4`6")
3230 CFS4.58 feet (4`7")
3334 CFS4.67 feet (4`8")
3439 CFS4.75 feet (4`9")
3547 CFS4.83 feet (4`10")
3655 CFS4.92 feet (4`11")

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