Summary notes

SITUATION

Land allocations

• H.J. Andrews Experimental Forest
• Central Cascades Adaptive Management Area

Landscape management plan

• vegetation management modeled after historical fire regimes
• spatially- and temporally-specific timber harvest schedule
• alternative approach to aquatic conservation strategy objectives

Road data

• spatial data confusing, standards unclear
• attribute data old and unmanaged

OBJECTIVES

• Develop an integrated road restoration strategy

- establish road restoration priorities

- establish future maintenance levels and priorities

• Apply concepts and results from recent research

• Identify future research and monitoring needs

• Clean up road GIS layer

ANALYSIS PROCESS

Aquatic risks

Road ranking

risk factors

- field measurements

- GIS-derived data

watershed process rankings

- mass movements

- fine sediments

- hydrologic effects

Subdrainage ranking

Restoration priority

Human uses

Public

Private

Management

Research

ROAD RANKINGS - RISK FACTORS

Field measurements

- adjacency to fish-bearing streams

- culvert fill height

- sideslope steepness

- sustained steep road gradients

- road prism stability

GIS-derived data

- road age

- steep, shallow soils

- slope position

- rain-on-snow susceptibility

- stream/road crossing density

- fine sediment soils

ROAD RANKINGS - WATERSHED PROCESS EQUATIONS

Mass movement

risk of initiation = sideslope steepness + stability (x2) + slope position + road age + shallow soils + rain-on-snow susceptibility

transport risk = sideslope steepness + slope position + crossing density

magnitude of effect = fish (x2)+ culvert fill depth + crossing density

Fine sediment

risk of initiation = sideslope steepness (x2)+ road gradient (x2) + culvert fill depth + crossing density + road age + fine sediment soils

transport risk = sideslope steepness + slope position + crossing density

magnitude of effect = fish (x2)+ culvert fill depth + crossing density

Hydrologic effects

risk of initiation = sideslope steepness + slope position + shallow steep soils + rain-on-snow susceptibility

transport risk = road age + road gradient + crossing density + sideslope steepness

magnitude of effect = fish (x2)+ culvert fill depth + crossing density

SUBDRAINAGE RANKING

Ranking factors

- rain-on-snow susceptibility

- terrain

- road density

- stream/road crossing density

- aquatic habitat

- special status

RESTORATION PRIORITIES

• Road rankings summed for each road and assigned high/moderate/low
• Subdrainage rankings summed for each road and assigned high/moderate/low
• Restoration priority assigned to each road by following table:

Subdrainage Priority	Road Priority
	Low	Moderate	High
Low	Low	Low	Moderate
Moderate	Low	Moderate	High
High	Moderate	High	High

HUMAN USES

Uses ranked

• private
• mining
• cultural
• recreation
• research
• timber
• silviculture
• fire

Maintenance levels

• scores summed for each road and assigned off-system/level 1/level 2
• if any individual use rated maximum score, road assigned to level 2