101-21 ROBINSON CREEK K 45 
N55°53.2 W131°04.5 Previous No. 41 
KETCHIKAN, BEHM CANAL, E. shore 6 miles N.W. of Chickamin River 
MAJOR SPECIES Pink OTHER SPECIES Chum, coho, trout 
ESCAPEMENT TIMING Early. July-Aug. ESCAPEMENT MAGNITUDE _ >50,000 
SPAWNING FACILITIES Good above falls. The spawning facilities are limited and do not appear to be nearly 
as good as are found in far less productive streams. However, the escapements that have been observed here 
indicate that unusually good spawning conditions are present. 
STREAM TEMPERATURES Normal range. Observed ranges: 48-55°F., 1949; 53-63°F., 1950; 
51-59°F., 1951; 55°F., 8/26/52; 54-58°F., 1953. 
VALLEY DESCRIPTION Steep, stream cut glacial lower valley, wooded and very brushy. Upper valley glacial, 
heading in cirques. 
DRAINAGE 20 square miles (estimated). Snowfields in peaks over 4,000' elevation. Lake with outlet 2 miles 
upstream in upper valley basin is 1. 3 miles long, average width is.2 miles, .3 miles wide at head. Becomes 
precipitation fed in late August and September. 
STREAM MOUTH IDENTIFICATION Narrow, steep intertidal zone, lower stream with bedrock walls and 
large boulders, steep sides, very brushy. Mouth in small cove with a long point extending S. from N. side. 
ANCHORAGE Inclose to S. shore of cove, 100 feet off bedrock bank. Very little shelter during strong southerly 
winds. 
TRAILS AND SURVEY ROUTES Trappers trail on S. side of stream starts up through brush and follows steep 
valley side. Bears help keep it clear upstream. Above falls, climb steep hill on S. side starting up small tributary 
and cut back to creek . 1 miles above. Game trails follow S. bank to rapids and barrier falls area above beaver 
ponds. 
AERIAL SURVEY NOTES Very limited visibility even during good light conditions. Steep valley sides, limited 
altitude of flight. Lake size sufficient for landing. 
INTERTIDAL ZONE 
LENGTH Less than . 1 miles AVERAGE WIDTH/DEPTH  30-40'/18" 
GRADIENT AND VELOCITIES Greater than 3° at 3' per second 
BOTTOM _ Rocks, boulders, some gravel, bedrock. 
HIGH TIDE LOCATION Above pool 100' upstream from beach at low rapids. Steep sides, and boulders. 
SCHOOLING AREAS Pool below high tide and at the mouth of the stream. 
SPAWNING AREAS Very limited gravel section at lower end of pool below high tide and riffle at upper beach 
section. 
GENERAL NOTES During large escapements, the mouth and intertidal section are jammed with salmon during 
the initial run. 
UPSTREAM 
LENGTH ACCESSIBLE 1.4 miles AVERAGE WIDTH/DEPTH 30-40'/18-24" 
GRADIENT AND VELOCITIES Greater than 3° at 2-3' per second 
BOTTOM Sand, gravel, boulders, bedrock. 
MARKER DISTANCE 1.3 miles. 
MARKER IDENTIFICATION Blazed tree on S. bank above first rapids beyond island at head of the low 
gradient section. Beaver pond across stream. 
BARRIERS Steep gradient with rapids and series of small falls above marker. Impassable falls below lake. The 
series of falls . 3 miles above high tide are a serious barrier to migration during low water. 
TRIBUTARIES Small tributary enters low gradient area . 8 miles upstream on S. side. Several small trickles 
enter stream on N. side above to marker. 
SCHOOLING AREAS Schooling is found throughout first . 3 miles to falls during runs due to hinderance of falls. 
Resting pool above falls and in lower section of low gradient stream above canyon. 
SPAWNING AREAS _ Most important spawning areas are above the first falls. Some gravel areas between the falls 
and the canyon. Excellent spawning areas in the area below the marker. 
GENERAL NOTES This stream is remarkable for its productivity. Apparently, spawning conditions are unusually 
good for pink salmon, resulting in runs far better than streams which appear to be far better. 
