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Daily discharge, in second-feet, of South Fork of Crow River near Rockford -Continued.

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Daily discharges based on a well defined rating curve except July 27 to August. 10, 1909, when the control was temporarily changed. This curve was applied indirectly during the latter part of 1911.

Monthly discharge of South Fork of Crow River near Rockford.
[Drainage area, 1,160 square miles.]

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Location.

CROW RIVER AT ROCKFORD.

At the highway bridge at Rockford, a little more than a mile below the junction of the North and South forks. Between the junction and the station are the outlets of Rebecca Lake and Lake Sarah, both of which are very small streams.

Records available.-June 4, 1909, to December 31, 1912.
Drainage area. -2,520 square miles.

Gage.-Vertical staff; datum unchanged since established.
Channel.-Permanent.

Discharge measurements.-During high and medium stages discharge measurements are made from the bridge, but during low stages measurements are made from a boat and cable several hundred yards downstream.

Since that date

Regulation. —A short distance above the station is the 7-foot dam of a flour mill which operates intermittently. As the turbine uses but a small portion of the flow, the effect of shutting it down is inappreciable at the gage except during extreme low water. At that time four readings per day are taken to determine the mean flow. This dam was partly destroyed May 31, 1911, and has not yet been rebuilt. the dam has no effect upon the flow at this station. Winter flow.-Gage heights are affected by ice during extremely cold periods but for the remainder of the winter are unaffected. Accuracy.-Conditions at this station are favorable for excellent results and therefore the records should be reliable.

Stations were originally established on both forks above their junction to be used as a check on the Rockford records, but the conditions on the North Fork were so unsatisfactory that its station was discontinued June 30, 1910.

Daily discharge, in second-feet, of Crow River at Rockford.

Day.

Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Νον. Dec.

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Daily discharge, in second-feet, of Crow River at Rockford-Continued.

Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec.

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Daily discharge, in second-feet, of Crow River at Rockford-Continued.

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Nov. Dec.

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NOTE. Daily discharges determined from a well-defined rating curve.

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Monthly discharge of Crow River at Rockford-Continued.

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NOTE. Practically open-water conditions during the winter except during 1912, when the winter estimates were based on discharge measurements and climatological data.

Estimated.

CROW RIVER NEAR DAYTON.

Location. One mile above the mouth of the river near Dayton. There is no tributary of importance below the junction of the North and South Forks. This station was maintained by the United States Engineer Corps.

Records available.—October 14, 1896, to September 13, 1897. These records have been compiled from unpublished data in the United States Engineer Office at St. Paul. As the drainage area at this point is only 3% larger than that at Rockford with no intervening tributaries, the records at the two points are directly comparable.

Drainage area. -2,590 square miles.

Gage. No data. This was relatively unimportant as very frequent dis

charge measurements were made, and the estimates based almost directly on these.

Winter flow. The river was frozen over during the winter months, but measurements were made to determine the discharge.

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