| Area |
North Fork |
| Topic |
Tour: Little NF & NF Gualala Photos of Channel 2001 #1 |
Click on image to enlarge (53K).This picture shows the convergence of the Little North Fork (at right) joining the North Fork Gualala River during summer 2001. The stream bottom is visible throughout the pool indicating a lack of depth. The amount of stored sediment here has caused the channel to be confined to a thin ribbon under the alders at right. Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (61K).This picture is looking down the Little North Fork Gualala as it joins the North Fork Gualala River, which is coming in from the left, during summer 2001. The shallow, narrow riffle and the wide gravel bar suggest that this is a large plug of sediment that has been deposited coming from the Little North Fork, although back pressure from the North Fork and its bedload could also have contributed. Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (56K).Henry Alden of Gualala Redwoods, Inc. stands at the mouth of the Little North Fork Gualala River during a pre-harvest inspection tour during summer 2001. Note the lack of depth in the pool at left and also that the pool tail crest appears to have very small particle size. Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (62K).This picture was taken looking upstream on the Little North Fork Gualala River just above its mouth during summer 2001. Note the water and batter marks on the clump of redwoods in the photo. The large amount of gravel that is plugging the Little North Fork channel here is causing flood flows to reach higher on the banks and up trees as well as extending floods and sediment deposits further into riparian zones (Hope, 2001). Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (109K).The hardwoods in the center of the photo is at least fifteen years old and were recently killed by aggradation of the North Fork Gualala River. These trees cannot survive when the water table rises higher than the base of the tree. This is clear evidence that aggradation has taken place in the last few years and that sediment contributions and transport in the basin are active (see Hypothesis #4 in Analysis Background pages). Photo provided by Dave Hope, North Coast Regional Water Quality Control Board..
Click on image to enlarge (67K).This picture shows a debris jam on the lower Little North Fork not far above its convergence with the North Fork Gualala River. The sediment deposits in the remains of the jam in the margin indicate that jam broke in 2001, which was a moderate water year. Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (110K).This picture shows the North Fork Gualala River during summer 2001. This reach is a wide and shallow riffle, with the low flow stream course partially tucked under the riparian alder canopy. The wide gravel bar and narrow active channel are symptomatic of aggradation (see Hypothesis #4). Photo provided by Dave Hope, North Coast Regional Water Quality Control Board.
Click on image to enlarge (53K).
Click on image to enlarge (61K).
Click on image to enlarge (56K).
Click on image to enlarge (62K).
Click on image to enlarge (109K).
Click on image to enlarge (67K).
Click on image to enlarge (110K).