113-12 TWELVEMILE CREEK K 175 



55-21.2' N. 132°44' W. Previous No. 145 



KETCHIKAN, CLARENCE STRAIT, KASAAN BAY, TWELVEMILE ARM , Head 



MAJOR SPECIES Pink, chum OTHER SPECIES Coho, red 



ESCAPEMENT TIMING Late. Sept. -Oct. ESCAPEMENT MAGNITUDE 



SPAWNING FACILITIES Excellent in the upper half of the intertidal zone and in all riffle areas through- 

 out the upstream area. 



STREAM TEMPERATURES Warm range (Observed temperatures: 46*- 49* F. , 1952- 52* F 9/5/53 



49* F. , 9/19/53). ' ' '' ' ' 



VALLEY DESCRIPTION Flows through a flat area with scattered patches of muskeg. The N. slope has been 



and is still being logged. The S. slope is heavily wooded. A few seed patches of trees have been left. 

 DRAINAGE 14 square miles (polar planimeter). Precipitation fed. 

 STREAM MOUTH IDENTIFICATION The stream enters a small bay at the head of Twelvemile Arm. 



Extensive grass flats are found along both stream banks in the mouth area. 

 ANCHORAGE For overnight anchorage the bay at Hollis may be used, or boats can tie up to the dock found 



there. The arm has good depth until near the upper end and suitable anchorages can be found. 

 TRAILS AND SURVEY ROUTES A skiff can be taken about 1 mile upstream. From this point the 



stream bed must be followed. 

 AERIAL SURVEY NOTES An easy stream for aerial survey with good light conditions. 



INTERTIDAL ZONE 



LENGTH 1.2miles AVER AGE WIDTH/ DEP TH 80'- 100 ' / 16"-24" 



GRADIENT AND VELOCITIES Moderate to gentle 



BOTTOM Gravel 



LOW TIDE LOCATION 



HIGH TIDE LOCATION At the log jam. 



SCHOOLING AREAS Numerous schooling areas are available throughout this zone. 



SPAWNING AREAS The major spawning area is above the half-tide mark. 



GENERAL NOTES 



UPSTREAM 



LENGTH ACCESSIBLE 6. 5 miles AVER AGE WIDTH/ DEPTH 40'-60'/12" 



GRADIENT AND VELOCITIES Moderate 



BOTTOM Sand and gravel. 



MARKER DISTANCE 



MARKER IDENTIFICATION 



BARRIERS None reported. 



TRIBUTARIES About 1 mile upstream a small tributary enters from the left side. 



SCHOOLING AREAS Several large holes between the high tide mark and the forks are utilized. 



SPAWNING AREAS Spawning occurs on all riffle areas in the main stream and to a small extent in the 

 tributary. 



GENERAL NOTES A forest service and FRI cabin is found at the upper end of the intertidal zone. An ex- 

 tensive logging operation is being conducted here by the Campbell Logging Company. 



