English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Construction of an interstate highway is planned near Rogers Lake in Dakota County, Minn. Samples of water and bed material were collected at six sites during March 1976 to April 1978 to determine selected physical, chemical, and biological characteristics before construction. Samples were collected at least twice during each season of the year. Data derived from these samples will provide baseline information to aid in assessing the impact of highway construction on the water quality of the lake. Rogers Lake is separated into an upper and lower lake by a culvert; both were eutrophic and dominated by blue-green algae year around. The upper lake is a closed basin; it is shallower and contains less water than the lower lake and had higher concentrations of dissolved solids, nitrogen, and phosphorus. Phytoplankton cell counts were also higher in the upper lake. Analyses of water from Rogers Lake suggest that sodium and chloride concentrations were higher than in ground water or in water in some surrounding lakes. Sodium ranged from 7.2 to 55 milligrams per liter, and chloride ranged from 15 to 130 milligrams per liter. Concentrations were highest in March 1978, when most of the lake water was frozen. Much of the sodium and chloride may have been derived from road salts used for deicing. INTRODUCTION Construction of Interstate Highway 1-35E near Rogers Lake in Dakota County, Minn. (fig. 1) has been proposed by the Minnesota Department of Transportation. As part of an environmental impact study, a water-quality assessment during preconstruction, construction, and post-construction phases is planned. The purpose of this study is to provide preconstruction water-quality data for Rogers Lake. ENVIRONMENTAL SETTING Rogers Lake is in the Twin Cities Metropolitan Area in the municipality of Mendota Heights. The lake fills an ice-block depression in till of the St. Croix moraine formed during Wisconsin Glaciation (Bray, 1977). Rogers Lake has a surface area of 116 acres and is divided into an upper and lower lake by Dakota County Road 16 (fig. 1). A culvert under the road connects the lakes, but it was plugged during the time of the study. Rogers Lake is, in effect, two separate lakes (hereafter Rogers Lake or "the lake" refers to both).

Water quality of Rogers Lake, Dakota County, Minnesota