Talk:Ridley Creek

1984 Pennsylvania Gazetteer of Streams II


This book gives the the facts that Ridley Creek is a tributary to the Delaware River and the two counties (Chester and Delaware). Then it says the source is at 600 feet (183 meters) near Frzer in Chester Co. (near here means more than 1 mile away). The mouth is at 0 feet at (within 1 mile or less) Eddystone, Delaware Co. On page 406 it gives the mouth coordinates as 39 51 39 N 75 18 51 W. The course is southeast, the drainage basin area is 37.9 square miles (98.2 sq km), the length is 23.4 miles (37.7 km). The Meander ratio is 1.18, the relief ratio is 25.6, the channel slope is 21.5 feet/mile (6.6 m/km) (this is slope between 10 and 85% of the total length). For physiography, the headwaters are in the Piedmont Upland section and the mouth is in the Coastal Plain province; the rocks are sand and gravel, granite gneiss, and mica schist; the drainage pattern is dendritic and the channel pattern is regular. The main channel runs through moderate to low hills in a narrow steep sided valley with steep to moderate slopes. Mean annual precipitation is 42 to 44 inches (1067 to 1118 mm).

This includes streams with drainage basins greater than 25 square miles. On page 7 it says "When the stream is formed by the junction of two tributaries, the tributary with the larger drainage area will be considered the source." The Branches are not in this (too small), but the Northeast Branch is bigger.

2001 Pennsylvania Gazetteer of Streams
This has watershed areas and river miles for all named streams in Pennsylvania. It gives the drainage basin area of Ridley Creek as 37.90 sq mi (agrees exactly) and gives its river mile as 83.30 miles (??). It also gives the following for the branches:


 * East Branch Ridley Creek, 21.95 river miles, 0.49 sq mi drainage basin, mouth at 40 01 03 N, 75 32 22 W.
 * Northeast Branch Ridley Creek, 21.95 river miles, 0.58 sq mi drainage basin, mouth at 40 01 03 N, 75 32 22 W.

So they are both 21.95 miles from the mouth of Ridley Creek, which is a figure that could be used in the article.

USGS GNIS
This also has coordinates of mouth and source for each and (unusually) rough lengths and a bit of history and etymology.


 * Ridley Creek is "29 km (18 mi) long" here (also gives some etymology as well as coordinates and elevations for the source and mouth).
 * The East Branch is "1.1 km (0.7 mi) long" according to its GNIS page
 * The Northeast Branch is "1.6 km (1 mi) long" according to its GNIS page.

Summary
If you take the 2001 Gazetteer distance (21.95 miles) and add it to the GNIS length of the Northeast Branch (1 mile) you get essentially 23 miles long, which is a decent match to the print Gazetteer value of 23.4 miles.

If I were writing this, I would use the 23.4 mile length for the creek including the NE Branch, and the 21.95 mile length from the source to the mouth. Hope this helps, Ruhrfisch &gt;&lt;&gt; &deg; &deg; 02:47, 6 October 2009 (UTC)

PS Gertler's Keystone Canoeing also has a page on the creek (though it does not address the total length). Ask if you do not have access to this and I can summarize the data here. Ruhrfisch &gt;&lt;&gt; &deg; &deg; 11:45, 6 October 2009 (UTC)


 * Just to repeat, since the USGS GNIS defines the source as the confluence of the two branches, I would use the 21.95 mile length in the lead. I would mention as well that the PA Gazetteer of Streams II gives the 23.4 mile length when the longest branch (NE) is included. Hope this helps, Ruhrfisch &gt;&lt;&gt; &deg; &deg; 14:27, 10 October 2009 (UTC)

External links modified
Hello fellow Wikipedians,

I have just added archive links to 1 one external link on Ridley Creek. Please take a moment to review my edit. If necessary, add after the link to keep me from modifying it. Alternatively, you can add to keep me off the page altogether. I made the following changes:
 * Added archive https://web.archive.org/20090906051324/http://rosevalleyborough.org:80/history.htm to http://rosevalleyborough.org/history.htm

When you have finished reviewing my changes, please set the checked parameter below to true to let others know.

Cheers.—cyberbot II  Talk to my owner :Online 06:59, 18 February 2016 (UTC)

External links modified
Hello fellow Wikipedians,

I have just modified 1 one external link on Ridley Creek. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive http://web.archive.org/web/20160210070243/http://waterdata.usgs.gov/pa/nwis/current?type=flow to http://waterdata.usgs.gov/pa/nwis/current/?type=flow

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at ).

Cheers.— InternetArchiveBot  (Report bug) 16:11, 21 July 2016 (UTC)