station V. S. 23 Highway Bridge CO2 0.0 ppm. 



Time 9ih^ A. M. Phenolphthaline 



Alkalinity 2.0 ppm. 



Air Temp. 70 degrees F. Methyl Orange 



Alkalinity 118.0 ppm. 



Water temp. — 72 degrees F. O2 7-3 Ppm. 



Sea lamprey runs had been noted in this stream by Conservation 

 Officers and local residents for several years prior to 19li7. I 

 strongly suspect that its history'- in this regard dates back to the 

 first runs noted in the neighboring Ocqueoc River by local resi- 

 dents (circa 193h-3^) i^or both streans undoubtedly draw from a 

 common stock of adults living in, or entering, Hammond Bay. Being 

 thus assured of a run upon which we coTild experiment, a site for 

 the construction of a sea lamprey v/eir -vnas selected just below the 

 U. S. 23 highivay bridge crossing the stream. This site, located 

 ^vithin the higliway right-of-way, was easily accessible for con- 

 struction and maintenance, and was only a few hundred feet above 

 the estxiarine waters of the creek. This latter point is of import- 

 ance in control since to be most effective, a sea lamprey weir 

 should be placed ideally doivnstream from the Icfwest potential spawn- 

 ing area. 



(2) The Carp Creek sea lamprey weir 



The Trveir and trap constructed in Carp Creek was of the single 

 "V" type with the trap placed at the apex of the "V" . The stream 

 is 22 feet wide at the point of construction and each wing of the 

 "V" was 18 feet long (Figures 7-10). This structure was originally 

 built as a temporary weir, pending the completion of a more ela- 

 borate, permanent device. Due to difficulties in installation, the 

 latter was abandoned and the temporary structure -was improved and 

 made more nearly permanent. For supporting the screen face of the 

 wings, 9-foot, steel, snow-fence posts were driven into the bottom; 

 each was buttressed on the downstream side with an identical post. 

 Four additional posts were driven as anchors for the box-type trap. 

 Sections of salvage rock and gravel screening, 28 inches by 9 feet, 

 were vri.red to the upstream side of the steel posts. Placing them 

 in pairs, one above the other, gave each wing a height of 56 inches. 

 This screen was of inch mesh, heavy gauge wire (3/16-inch diameter) 

 reinforced along one edge v/ith angle iron, and tlierefore quite rigid. 

 Using this coarse grid for support, hardware cloth of l/2-inch mesh 

 was laid against the upstream side of the heavy screening and wired 

 to it. The "vvings were joined at the shore to a baffle of double 



21 - 



