Contents 



Preface v 



Conversion Factors, Non-SI to SI (Metric) Units of Measurement vi 



1 — Introduction 1 



Work Unit Objective and Monitoring Approach 1 



Project Location and History 2 



Purpose of the Study 13 



2 — Monitoring Plan and Data 14 



Targeting and Ground Surveys 14 



Aerial Photography 20 



Photogrammetric Analysis of Armor Unit Targets 20 



Broken Armor Unit Survey 23 



3 — Summary 31 



References 32 



Tables 1-4 



SF298 



List of Figures 



Figure 1 . Project location 3 



Figure 2. Concrete monolith structure constructed on south jetty in 191 1 6 



Figure 3. Typical cross section of north jetty 9 



Figure 4. Typical cross section of south jetty 10 



Figure 5. Typical repairs made to jetties in 1988 11 



Figure 6. Current project as of December 1994 12 



Figure 7. Aerial photograph of Humboldt Bay jetties (1997) 13 



