CSAH 17 (South Lakeshore Drive) Preliminary Plan Review May 14, 2020
Pres esen entation on O Overview • Review map of CSAH 17 and proposed project corridor • Review County State Aid Rules and history of South Lakeshore Drive • Review established goals for South Lakeshore Drive corridor and how they are being addressed in the preliminary road design. • Discuss differences between Reconstruction and Reconditioning as it pertains to State Aid Rules. • Review the typical cross-section for each segment of the project. • Review the preliminary plan layout. • Summarize next steps • Provide opportunity for comments and questions
Minn. Rules Chapter r 8820 Sta tate-Ai Aid Operations ns • South Lakeshore Drive is a County State Aid Highway (CSAH 17) and is regulated by Minn. Rules Chapter 8820 • South Lakeshore Drive has been under county jurisdiction (under various labels) since 1869 when it was first petitioned to be established as a county road and ordered by the county board at that time. • South Lakeshore Drive has been designated as a County State Aid Highway since the creation of the state aid highway system in 1957. • In 2010 the State of Minnesota designated a portion of CSAH 17 as a Type II Natural Preservation Route at the request of landowners and support of the County.
Existing Conditions • The majority of the project area was last paved with a new surface over 30 years ago and the existing surface conditions are very poor. • The majority of the existing pavement width is 20’ (10’ driving lanes). • The existing constructed shoulder width is 2’ on each side, but grown over with vegetation in most areas. • The existing roadway drainage is marginal. Culverts are functioning adequately, but due for replacement. • There are a number of pedestrian users, both crossing traffic and along the roadway. • There are increasing conflicts with larger vehicles and encroaching trees.
South Lakeshore Drive C Corri rridor r Goals • The County Board has established 7 specific goals by resolution for the South Lakeshore Drive Corridor. • Some established goals are in conflict with other goals. Therefore, the achievement of the goals in the aggregate, is a balance between each of the goals and the priorities of each goal, relative to the others.
South Lakeshore Drive C Corri rridor r Goals 1) To the extent possible, limit construction work and permanent roadway impacts to the existing right-of- way boundaries. • Adjust horizontal and vertical alignments to minimize impacts and stay within the existing right-of-way boundaries while maintaining provisions for other identified goals. • Make special design adjustments in specific critical areas. • Utilize Temporary Construction Easements when necessary.
South Lakeshore Drive C Corri rridor r Goals 2) To retain the scenic value of the corridor by retaining existing views of the lake while limiting tree removal and cooperating with landowners on tree replacements. • Closely follow existing horizontal alignment while making slight shifts to save certain desirable trees. • Visit with individual landowners impacted by planned tree removal.
South Lakeshore Drive C Corri rridor r Goals 3) To improve roadway surface conditions with a new paved surface with a 20+ year design life. • Final design will be for a 20-year design bituminous pavement. This requires removal of existing pavement to address poor existing surface conditions and create uniform base and pavement structure. • Plan to phase construction over 2 year period with initial paved surface in 2021 and final wearing course constructed in 2022.
South Lakeshore Drive C Corri rridor r Goals 4) To improve drainage conditions adjacent to and on the roadway’s driving surface such that stormwater is not retained on the roadway. • Replaced drainage culverts and evaluated surface water runoff. • Removed traditional crown in certain areas to allow for surface water to flow across the road in order to avoid ponding along edge of road. • Included sections of curb and gutter to contain and discharge stormwater in desired locations.
South Lakeshore Drive C Corri rridor r Goals 5) To maintain or reduce existing posted and actual traffic speeds throughout the corridor. • Retaining existing posted speeds and evaluating advisory speed warning signs. • Retaining 10’ driving lanes. • Considering traffic calming features such as raised pedestrian crosswalks and driver feedback speed limit signs.
South Lakeshore Drive C Corri rridor r Goals 6) To accommodate pedestrian and bicycle traffic throughout the corridor, including a widened shoulder where possible, or a separate, adjacent trail. • Plan utilizes widened shoulders on one or both sides and does not provide a separate or designated bike trail. • Shoulder width remains sub-standard for shared bike and pedestrian use and does not fully achieve the goal, but is an improvement over existing condition.
South Lakeshore Drive C Corri rridor r Goals 7) To accommodate truck and large vehicle traffic with adequate structural strength and driving lane width and clearance to prevent lane departures. • Plan 10-Ton axle weight pavement design. • Plan to remove or trim trees that do not provide sufficient overhead clearance for emergency vehicles, trucks, and construction traffic.
Minn. Rul ules C Chap hapter 8820. 8820.020 200 Recons nstruc uction v n vs. Recondi ditioni ning • “Reconditioning” includes resurfacing, replacement, or rehabilitation of the pavement structure to extend the life of the roadway and effectively address safety and operations through minor improvements to the existing facility. Reconditioning projects generally utilize the existing horizontal and vertical alignment, may entail minor widening or geometric improvement, and normally require little or no additional right-of-way. Reconditioning may include changes to vertical or horizontal alignment in no more than 20% of the length of the project. Work does not normally extend beyond the existing ditch bottom.
Minn. Rul ules C Chap hapter 8820. 8820.020 200 Recons nstruc uction v n vs. Recondi ditioni ning • “Reconstruction means (1) the replacement of an existing roadway on a similar alignment or (2) the replacement of an existing bridge with a completely new bridge. • In conversations with the State Aid Division of the MN Department of Transportation, it has been determined that although our preliminary project design may fit under the definition of “reconditioning” it would be more appropriate to utilize the “reconstruction” standard since we intend to replace the existing roadbed with a new, uniform base structure. • This determination does not affect our proposed design, but rather the standard we are utilizing to measure our design against. • Using the reconstruction standard will require the county to apply for a variance from the minimum design standards for the reconstruction of Type II Natural Preservation Routes. (8820.9981)
8820. 8820.9981 81 Mini nimum De Design Stan andar ards vs. Prop opos osed ed D Design gn Standard • 40 mph design speed (30 mph in suburban areas) • 11’ driving lane width • 3’ shoulder width (6’ if popular bike or pedestrian use) • 1:4 inslopes • 9’ clear zone (clear space from fixed objects from edge of traffic lane) Proposed • 30 mph design speed (exceptions for reductions at various curves and conditions) • 10’ driving lane width • 1:4 inslopes minimum • Variable shoulder widths 2’-4’ (26’-28’ total pavement width) • Variable clear zone width (as little as 1-2’ beyond design shoulder width)
Preliminary P Plan L Layout
Next S Steps • Summer 2020 - Work with landowners impacted by tree removal or temporary easement • Fall 2020 – Complete preliminary construction plans, submit necessary variance requests • Winter 2020 - Finalize construction plans and specifications, acquire necessary permits, remove identified trees • Spring 2021 – Award construction contract • Summer/Fall 2021 – Construct Phase 1 • Summer/Fall 2022 – Construct Phase 2
Comments and Questions Any comments or questions can be sent to: csah17@co.pope.mn.us Brian Giese, PE Pope County Engineer 16139 State Hwy 29 Glenwood, MN 56334
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