HIGHLIGHTS FOR 1991 



The Poplar River Power Station completed its eighth full year of operation in 1991. The 

 two 300-megawatt coal-fired units generated 4 534 000 gross megawatt hours of 

 electricity with the average capacity factors for Units No. 1 and 2 recorded at 88.7% and 

 86.2% respectively. 



Monitoring information collected in both Canada and the United States was exchanged 

 quarterly. In general, the sampling locations, frequency of collection, and parameters met 

 the requirements identified in the 1991 Technical Monitoring Schedules set forth in the 

 1990 annual report. 



Regional drought conditions continued, resulting in below normal streamflow in the Poplar 

 River basin for the fifth consecutive year. The March to October recorded flow at the 

 International Boundary was 3 720 cubic dam^ or 37% of the 1931 to 1990 median 

 seasonal flow. A volume of 459 dam^ was delivered to Montana between May 1 and May 

 30 to meet the apportionment recommendations of the IJC. 



On January 1 , 1 991 , Cookson Reservoir storage was only 54% of the full-supply volume. 

 Reservoir contents reached a maximum of 26 700 dam^ in July. 1991 reservoir levels 

 were below ten-year median levels. The net effect of little spring runoff over the last 

 several years has been a decrease in reservoir water quality. 



VII 



