1. The effect of Oregon Climate on Crashes
By: Jay Marston, Tyler Wall, and Quinn Brady-Shubert

2. Project purpose We wanted to see if there was any relationship
precipitation and crashes
landslides and crashes
We predicted that the more precipitation there would be and increase in crashes compared to the dryer parts of Oregon. Also, we predicted that there will be a greater number of crashes will occur around areas that have landslides.

3. Background
Oregon is a state that is filled with different types of terrains and climates.
Precipitation rates in wester half of the state are high
The central and eastern part are very dry
Mountain ranges cause different slopes

4. Background
The area that is has the highest population is in the Willamette Valley which also gets a high amount of precipitation.
Major highways that go through Oregon
I-84
I-5

5. Precipitation vs Crashes GIS Methods
Raster to polygon
Define 1 and 2 as dry, 3 and 4 as moderate, 5 and 6 as wet, 6 and above as very wet
Rainfall DEM
Reclassify into bins of 500
Search by attribute
dry, moderate, wet, and very wet
Download data from Oregon Spatial Library
Intersect
Insert Data File
Crashes
Open attribute table of fair and above pavement, add field, select short integer type, Label new field COND_INDX
Field calculator
def Reclass(pc):
if "FR" in pc:
return 3
elif "GD" in pc:
return 4
elif "VG" in pc:
return 5
PvmtCond,
Select by attribute, pavement condition=fair or good or very good
Intersect Crashes with Fair or Above Pavement
PvmtCond

6. Precipitation’s Effect on Crashes

7. Results

8. Landslide Effect on Crashes

10. Results

11. Results

12. Intersect crashes/pavement with landslide areas
Landslide Data
Intersect crashes/pavement with landslide areas
Download data from Oregon Spatial Library
Insert Data File
Crashes
PvmtCond,
Select by attribute, pavement condition=fair or good or very good
Search by attribute table for weather conditions at time of crashes
PvmtCond
Open attribute table of fair and above pavement, add field, select short integer type, Label new field COND_INDX
Intersect Crashes with Fair or Above Pavement
Field calculator
def Reclass(pc):
if "FR" in pc:
return 3
elif "GD" in pc:
return 4
elif "VG" in pc:
return 5
Group all conditions with precipitation (rain, snow, sleet, fog) together, and conditions without precipitation together
Compare ratio of crashes that occurred with precipitation and without precipitation for landslide areas and non-landslide areas
Repeat last step but this time for crashes that occurred outside of landslide areas

13. Conclusion
The results that we found were that the weather doesn’t necessarily effect the crashes in Oregon
Also, landslide areas still have a low rate of crashes as well.
There could be other factors involved with the data
Our next experiment could look at the time of day and weather conditions and how they effect crashes.

14. Thank You